Today I had to open Poly to reset it - yesterday I attached it to charger, and today I found it dead. I don't get it at all, but that's nothing new for me - being still an early alpha release Poly is performing quite nicely anyway (when it works of course).
It seems to me that hex screwdriver is a must for any Poly user, who wants to avoid 6 (or more) hours breaks in listening on the go. I wonder if they will let me take my toolbox into the plane.
Fun stuff

That being said, build quality is as nice on the inside as it is on the outside. All fits nicely. I'm worried that if I would need to disconnect it more frequently, the connector might not take it well, as it is quite fragile. On the other hand, it seems to be enough space inside in the upper part of the case (where the battery is fitted) to place a micro switch for the battery - might work wonders actually, both for dealing with obligatory battery drain and occasional need for veeery hard reset. I will try to discuss this with someone as soon as my warranty expires.
The worst thing for a beginner Poly disassembler is this bent plexiglass rod that transfers Mojo light, But hey, no one said Poly is for pansies...
Edit: Some disassembly tips.
When you remove the 4 bottom screws, the unit is more than ready to come apart. It does not want to, since plastic "window" is quite snugly fitted, so you need ro use some delicate but significant force. Plastic phone openers come handy.
While pulling the unit apart try to lift the upper cover but leave plastic "window" in place. This way you will avoid the mess with placing light rod back between the holes.
The battery is glued to the top cover, but it connects to the circuit board that's on the bottom. Don't pull them apart much.
The connector comes off easily. You can use your fingernail or plastic phone opener. After a few seconds push it back in place and that's it.
If you used too much force just like myself, the chances are you will suddenly find the light rod on the floor. Don't panic. Unscrew the circuit board, remove it, push the rod into the bottom hole of the plastic "window", and place it back where it belongs. You can also slide up the plastic mojo wall of Poly, to make positioning easier. Either way, you need to put it back together along with the circuit board. It's not difficult, all fits well.