Well, in fact, I didn't want to sound negative. After all we are not supposed to open the Pandora ouserlves, and people at OPT obvioulsy know this possible risk. (I want to precise that I did not mix screws, and that I used the shortest ones under the battery, but it still seems they are a bit too long if you overtight them).
Frankly I find the Pandora overall quality very good, in fact better than what I had expected. The case painting is nice, the hinge is firm (I can put it in any position and it stays in place), the shoulder buttons work fine, the keyboard is surprisingly pleasant to use, the game controls are top notch and the screen is also great (with no dead pixels). So all in all, this is a nice achievement for such a small team. Just be careful with the screws, and you should be fine.