Let me preface this by saying I like my Gbox 200. I like it a lot. But I'm also a tinkerer and have no issue fixing things as they go wrong. Which I find myself doing routinely with my Gbox 200.
The 510 loves to come loose, which results in a wobble. Easy fix, just take the back panel off with a Torx screwdriver, tighten it back down, and close.
The squonk bottle that comes with it is prone to cracking and leaking. Easy mod, just take the stem out and replace the entire assembly with a silicone squonk bottle (you'll need a magnet mod or some ingenuity to make refilling the bottle easy unless you have a squonk refill bottle).
The bottom screws stripping out makes the batteries occasionally lose continuity. Okay... That I don't have a fix for. That's bad design. So is having to hold the batteries in whenever you take out the squonk bottle to refill it.
I'm personally not a huge fan of the Radar atty, but that's subjective.
All in all, I can't recommend this mod to anyone who isn't willing to put up with its flaws. If you're okay with doing a little work on maintenance with the 510 and possibly replacing the squonk bottle with one that isn't terrible (and the entire squonk stem assembly with it), it's a very nice mod. But as it is out of the box, it's a huge misstep on Geekvape's part, and I can't recommend it.