Mine is the Ivogo (white box with "18+" on the upper right corner) and I absolutely love it - it's one of my favorite daily carries now, but it took A LOT of work to get it there. So maybe stay away from that one - that was waaay too much trouble to go
through - definitely not ready to go out of the box.
Things to watch out for:
The deck screws - make sure the heads are small enough to clear the lip on the chimney. The original screws on the Ivogo had big heads that gouged the nonconductive coating on my chimney, and you can't
buy these screws without having to grind down the heads yourself.
The positive post - Ivogo's didn't really have good insulation on that (just a teeny tiny o-ring), so it would wobble like crazy. I used a KFL 510 insulator, which incidentally is a new item at Fasttech - maybe not a bad thing to stock up on - they come in handy.
The top threads on the chimney - mine didn't have anything there to properly seal them for vacuum. I wrapped them with teflon tape. If the tank is emptying on you, it could be a vacuum leak from there.
The tank insert - test it for leaks with water first (it'll sweat out of the triangle windows). Sometimes they left out one of the o-rings at the factory, sometimes they just didn't push the insert in far enough, so try pushing it in first, and wiggling it around to make sure the o-rings are seated right, before you drive yourself nuts trying to put the o-rings in.
There were a bunch of other things I had to fix, but these were the big ones for me. I love my SqR, but if I were on the fence between this and an Aqua V2, I think the Aqua V2 is more everybody's favorite right now...