[Defy Q&A, Help & Troubleshooting] wookario:
Let's call them "impressions review" in few simple points :)

1. The exterior is made very well. The used parts, have no loose places, all fits tightly, and gives no strange or unexcpeted sounds. The back cover lid is suited very tightly, even opening it, is troubling, thus you have to use some force, to release all of the clamps which hold them. The battery is secured buy a rubber seal, looks tight. Some doubts as to waterproof, give the exterior speaker cover - looks like it was not waterproof, but I have not tested it yet.

The USB port is covered well, with a very well fitted part, secured with a rubber seal. The whole phone, fits well in the hand, and if feels secure to hold.

The colors are interesting, and the body of the phone is made probabily of aluminium.

In total 9,5/10 for design and fitting the elements. Really nothing to complain about.

2. The interior - firmware. I bought the phone with an original chineese firmware. It wasn't my choice, but the guy I bought the phone from, just ordered it this way - due to his language abilities :) First look - SHIIIIIT!! Everything in chineese!! But fortunatelly I was able to change it into english. Then I installed Titanium Backup Pro (paid version), and to my shock, it came out, that original chineese rom is ROOTED :))) Some chineese trees appeared, and titanium could do everything. So I started from removing all chinnese apps, that I didn't know the purporse (backing them up previously). Due to the fact, that chineese phones do not use google play store (Lenovo store instead installed) so then I installed google play store (I used a trick found in some forum to do that, couse using a .apk file crashed all the time). Now I have a google play store, but without all the unused google **** like street view, google maps and more, which usually stuff the internal memory of the phone.

The RAM is 1GB total - for me used like 45% of that amount, so enough left, not to worry if any app will have enough room to install. The internal phone storage is 2,6GB build in, so also enough for basic use. Also a place to fit a micro SD card, so in total you have really plenty of room, to fit apps, and other stuff.

The firmware is very stable, since saturday, it did not crash at all, it's very fast, and in my opinion the quad core works perectly with 4.2.1.

My score 8/10 lack of one point, for not a "standard modded firmware", would be much nicer, if in basic version, it would have a european firmware. One point also less for GPS problems - see below.

3. The display. To be honest the best part of the phone is the display. 4,5'' 960x540 is just enormous. The colors are really nice, and well saturated. The touch screen is very sensitive, and "user friendly". For me 10/10

4. The only problem I did not cope with, is the GPS. It just cannot fix on satelite. Tried many solutions found in internet, but none working. Maybe is the chineese firmware problem, or maybe it's just faulty. Will try to fix it, but I'm starting to doubt :(

In total I rate the phone 9/10, only GPS is the real problem, all else, including chineese firmware is to be accepted. I'm comparing it to AGM ROCK V5, which is running android 2.3. The difference in usage between theese two, is a milestone + for S750.

Since AGM ROCK V5 was virtually indestructable, mine one unfortunatelly broke the screen, by landing flat onto concrete :( So I would not try this with S750 :)

For now I have not tested it's waterproof ability. But maybe I will not be the first one to do that :)

In any more questions, feel free to ask :)

EDIT - I've managed to run GPS, now works like charm :)

http://xdaforums.com/showthread.php?p=43159201#post43159201