Hi all, I thought I would give my experience of the Heatvape Invader mini 50w, the Goliath RTA(both from Gearbest), and a new source I found for real VTC5 18650 batteries.
I've had the Invader for over a month and it does just as advertised. Pbusardo did an indepth review on youtube, so I won't bother typing one up. Combined with the Goliath and the VTC5's it is a dam good combo. I bought the Invader because I was looking for a temp control device that didn't break the bank, and for $65usd the Invader is a bargain. Using Kanthal it detects that and automatically goes into wattage mode. With NI200 or Titanium it sees that and goes into temp mode. I have not personally experienced some of the minor problems Pbusardo did even though mine is one of the first batch models. He says the second batch is without those problems, but mine hasn't exhibited any problems whatsoever. Maybe I got a batch 2 in a batch 1 box. *shrugs* The Invader is rock solid, durable as hell, and does what it says on the tin for a fraction of the price of other temp control units.
The Goliath RTA is not for novice builders, but if you take your time to get your coils right and properly wicked, it is a fucking beast. It has great flavor and huge clouds, but blows through liquid like a firehose. The build deck is smaller than it appears because the chimney fits rather tightly over it, so you can't really go bigger than coils wrapped on 2mm. NI200 or Titanium takes considerably more wraps than Kanthal, so you are forced to use smaller diameter wire, such as 30 gauge. I'm not kidding about the limited space under the chimney, so your coils have to be tight to the posts without touching. Once properly coiled and wicked I don't think the Goliath has a match to be honest. It isn't bothered but viscosity, doesn't leak, easy filling, no gurgling etc. You will need to use dual coil though. I tried it with a single coil and it is a nightmare.
I found a supplier called Orbtronics that have a supply of real Sony VTC5's in stock at a very reasonable price. I needed a couple more batteries and decided to give them a try instead of the Samsung 25r's(which are really good too but I could only find them in 20a discharge and Titanium wire requires 30a). Now I know why people rave about the VTC5's. They hit like a sledgehammer, stay consistent no matter what charge level until they shutdown. Truly great batteries priced similar to the 25r's. You can't go wrong with either, but if you are needing 30a discharge go with the VTC5's.