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The whole unit is bigger but this is the business end, feeding these will be the biggest problem.

TFV4 RBA v Subtank RBA and Quad coil V OCC

I've had one for just over a week now, seems like a fairly short time to make any defining conclusions but here I go.

Its huge, sitting on top of my Sigelei 150 makes the combo a real lump to consider carrying about, it put it in my back pocket whist pottering around the shed earlier and I had to tighten my belt up a notch

I've had one leak so far, the chimney to coil thread is short as is the coil to base thread  2>2.5 turns. I must nipped the narrow coil seal and whilst settling it back in undone it half a turn because after two pulls it gurgled and emptied out of the base. Grrrr

The quad coil is massively airy, I can't get any sensation of pull through it, drainpipe comes to mind. I've taken it up to 120w without my lungs collapsing from the heat although the tank does get warm/hot. I changed over to a normal 510 drip tip, the wide vented tip didn't really help matters. Setting the mod at 80-100w appears to be about right.
 I tanked my way through 20ml of juice and had to think about what was going wrong because although the clouds were massive there just didn't seem to be any density to them. Simply I'd say that the quad coils are not for me and I bought 3 packs

I haven't tried the triple coil, only having one and not being totally taken with the quads its still in the box.

I bought it primarily for the RBA....I'm a subtank user so its like heaven to have a large base to build on.  Even so the screw heads and the wire holes in the deck are tiny, the thick twist I use in the subtank rba  was too thick to fit in or under. I went for a basic 0.75ohm coil made from 0.5mm kanthal...4mm i/d, it fits with room to spare so why not?
I should have taken a picture when I wicked it, Scottish roll, teased it out into a huge dandelion kreed and cut it to shape when wet with just the bottom tips of the fluff in the juice wells. It took well over a ml to stick down and once in the tank and filled up I tentatively waited for a leak...nah!

 I made 60 ml of 80/20 T-juice Minty the Toff with Bavarian Cream at the weekend and last night the flavour fell totally flat with the quad coil. Too hot, too airy bit of a fail tbh.
So with today off work and time to kill I started at 40w which gave a stupidly cloudy vape that I've never had with the subtank, 50w gave an eat your heart out Mutation vapour, 60w ( Velocity redundant now), 70w still pulling like a goodun but not really any warmer than a pair of big coils in a dripper. At 80w I opened the drip tip up, just far too much air and the flavour went again I so backed down to 40w and closed the base up a little.
I've just done half a tank in 10 good pulls, its a damn good job there was only 1mg nic otherwise I'd be feeling decidedly ill instead of still chewing mint toffee and cream.

The rda is definitely the pick of the bunch so far, I'm not sure if I'm going to need to work out how to fit a more complicated coil and I haven't even considered Ni200 yet.
Twin coil base.....ummm maybe I'll order a couple later:D

I had the choice of three dual 18650 mods in my local shop, Smok, Sigelei or IVP4s. I could have bought over the net but I really wanted to get a feel for one and believe me I nearly wore the paint off two of them before making my choice.

The stainless finish of the Xcube really didn't do anything for me, neither did the grip firing bar. I was tempted by the bluetooth programming but aesthetically I couldn't live with the fingerprints.

On initial specs I would have ordered the IPV4s blind on the net but in the hand it was different. The battery cover felt cheap, fragile and the whole thing felt tinny. Yes it had a lower Ni rating, yes it was upgradable to 160w and Ti compatable but....the issue with the warranty on the IPV3, the rapid release of the 4s with no upgrade didn't inspire confidence.

I bought the Sigelei, a more hefty solid feel, tactile matt finish. That was it just the feel in the end, similar power, no Ti, no bluetooth, no USB upgradable firmwear. So far so good, I don't use it as an ADV I bought two pairs of batteries and have only recharged each pair twice.
 I fire up a couple of claptons at 80w in a velocity once or twice a week . I've started to use it with a TFV4 and quad heads....extra cloudy Sir? I've put juice in the tank more often than I've charged the 18650s.
My only issues are that the lovely soft finish shows every smear of juice and as mentioned in reviews the channel that runs all the way around the edge is prone to catch any juice if you are messy with a dripper.

In hindsight and now using Fastech and Gearbest, the Smok was very cheap last week down to c$55, the IVP4s is holding around $60. if I was buying today I'd go for the IPV4S. Paypal rates and UK express shipping... £41 or KOV if a UK source was prefered.

I've already drilled out the juice hole to 4mm, opening up the airflow seems like it could be my next step to making the V2 rba perform, found that the 'Scottish roll' makes a superb pancake type wick.

There is a 4 turn 0.2 ohm kanthal twist ( 0.5mm, 0.30, 0.25, 0.20) in this ball of fluff

to be honest my most satisfying sub-ohm build is from a derringer copy on a 20w mod, I use a 2.5mm i/d 28g 0.9 ohm coil at 12-15w. Taking cool flavour filled pulls from this makes squeezing claptons and twists into a bigger dripper seem like a lot of hard work.

My ADV  has been on a  subtank rba, twisted kanthal  ( 0.45, 0.30, 0.25, 0.20mm) 0.6 ohm at 22-25w, slow ramp up plenty of time for a cool hit and its so tough it can be rewicked over and over.

A couple of weeks ago I had yet another moment on GB and bought a Subtank nano and some Ni200 coils to go on an Istick 40tc.
No major problem with the set up and it runs quite nicely.
Thing is instead of a second pack of 0.15 Ni200s I somehow ordered a pack of coils with a red insulator
 Original Kanger Nickel Alloy OCC - NICKEL ALLOY 0.2 OHM
nothing listed about these anywhere besides GB and they are described as  Nickel Alloy OCC for temperature control mods
Pure organic Japanese cotton wicks, They are not even on the Kanger website but the serial number check pans out.
Kind of confuses because like the Ni200 coils my ohm meter wont settle on a stable reading close to their rating, but in TC mode both IpvD2 and istick read them ( I've checked the whole pack) steady at .18>.22 .

Any idea what have I purchased? Should i be using them in standard power mode or TC?

thanks Steve