Well, for $17 from Fasttech is about as low as you can get... and IMO, it's a good deal.. just have to wait for it. As far as the downsides of it, I've owned it since...April/May time, and used fairly heavily since. The biggest downside, is having to trap two coils on only two screws. That takes some practice...but luckily, I've "cut my teeth" on the Aqua.. which is very similar to it. The wicking is unique, and might throw a bunch of people off. I usually fan it out around the juice holes, and only a TINY bit (like 1/4th of the wick) goes down halfway down the juice channel. It wicks best that way. And lastly, like with all tanks, it can have difficulties in high VG juice. Filling the juice, you'd need to wait a while until the juice gets past the chimney.. otherwise, you'll flood the coils. After that, the wicking is slow with high VG juices, but that's normal.
I'd say it's a solid tank. I vape all the time at a .7 ohm build. The fact it's stainless steel and pyrex glass makes it a winner for me. The V5 is supposed to help with the coil capturing by having post holes, but the only version I've seen uses push button capture, which I don't have faith in.