jumpman and herb are right then, considering they have held the new coolfireIV+ mods within their hands- I assumed that they were made of plastic because they look plastic, and because I have made comments about them being made-of plastic in the past (base solely on the fact that they looked like they are made of plastic in pictures) and a couple/a-few different ECF members went-along and stated that they are (or must-be) made of plastic, so after that I was sold, and figured that they must-be made of plastic. But if herb & jumpman have HELD them in their hands, the CFIV+ models must-be metal, like the original CFIV models, however, they've got a really sleek/wet-look (plastic looking, lol) paint job. So either the CFIV or the CFIV+ are both well-made METAL body mods, according to jumpman & herb. I apologize for the assumption.
Now-then, I will congratulate you on your mod purchase (great choice!) and if you are indeed getting the kanger subtank, great choice as-well! I really enjoy mine. I currently have my subtank on my evic-vtc-mini with the rebuildable-platform inside. I built a 0.5 ohm coil with 30g kanthal & I'm realllly enjoying the rebuild-platform in the subtank at 0.5ohm/12.5 watts with my 6mg RWhy4 e-liquid from TheVapeTree. Great set-up!!!
I will say that I have tried the innokin top-coil tanks in the past (this was a looong time ago, considering we haven't seen new/popular top-coil tanks in quite some time, if I'm not mistaken, lol.. MOST vapers prefer BC-Tanks these days!) but yes, I tried the top-coil innokin tank and disliked it in comparison to my aspire vivi nova tanks. I did not like the build quality. I have also handled the original MVP & didn't like the size. IDK.... I am male, and I tend to look for the smallest (but highest quality) mods that I can find. For example: I own the Joye Evic-VTC-Mini, & the Kanger Subox Mini. I really loved the screen on the EvicMini, & I loved the form-factor of the SuboxMini. Both are my best/favorite regulated mods that I've ever owned. I still own/use my original Joye Evic Tube Mod & I cannot complain, it's still going very strong. I have GOOD FAITH in Joye. I still have Joye eGo batteries that work quite well & hold charge, and they are over 4-5 years old today, haha. I really like Joye. I never did like the look or "size" of the Innokin MVP box-mods, though. They always looked and felt way too bulky for my small hands. I am a short 5'5 male, 135-140lbs (usually lol) and I just HATE big mods in my hands. I hate the way they look in the mirrors... I hate everything about BIG mods, lol, and I write BIG with quotation marks, because MOST mods are smaller than they appear in pictures, & MOST mods I've handled are of managable size... However, some are just too big when there are much smaller mods available. For instance, I love my Silver Bullet, but why use my Silver Bullet when out of the house (where people will be looking at me as I vape) when I've got other much, MUCH smaller mechanical mods.... I LOVE mech tubes in 18350 mode for example, they are WAY small. I usually enjoy a mech in 18500 mode, outside of the house, though. 18500 tube mechs are the PERFECT size, imho.
& speaking of SMALL profile mods- now that there are "SIDE-BY-SIDE" box-mods, with the recessed-tank feature (the tank is recessed, so it is LOWER than the top of the box, (which is totally awesome, in my opinion) I have no plans to buy BIG mods ever again- Not when the side-by-side/recessed-tank box mods are available these days. I reallllly love my REO Grand with a small RDA on-top too, but with the advancement in bottom-coil/platform-slot-fed rebuildable tanks on the market, the REO has a fair chance at being replaced. (GASP! I doubt it, lol... I love them too much!) but, yes, with these great new tanks and the small (short) side-by-side/recessed-tank mods on the market, the REO has it's work cut-out for it....... Not that I would ever think about putting my Reo on a shelf, haha. It's built too well/too-cool a design- too nice a manufacturer- etc/etc... lol.
Long story short- There's a great variety of QUALITY, SMALL profile mods on the market these days, including the EvicMini, the SuboxMini, & of course, the CoolFireIV and CoolFireIV+ mods, haha. So, if you need a backup mod for your current CFIV or a backup mod for your backup mod for your backup backup backup mod, you have PLENTY of great SMALL/SHORT profile APV-Options, for sure! I want a XyvoStick!!!
& hey, while I'm here, let me just say 1 last thing...
ENJOY your vape journey!!!