One thing about Chinese motors. They are cheap and you can build a prototype quickly, but the Chinese can't make ball bearings to save themselves! After 13 flights I had a motor fail. I ordered two replacement motors from hobbyking since there's a change I'd get a bad motor. Well now my quad no longer dips towards the from starboard side! I'm going to try to locate American made ball bearings for this motor. I think once I install quality bearings the motors will last.
It's windy today so I can't test loiter but my large 6000mah Lipo is here and pretty soon it will be time to test with that. A 6000ma is heavier. I can lift it without any problems but I do not want to risk a hard landing. A hard landing under load just might be too much for the fiberglass arms to take. So far I've been lucky, I can take pretty hard landings with the 2200ma battery I have. I've only broken props. I figured with the additional weight it might be a good idea to absorb the shock of a hard landing with foam or rubber. Have any of you tried to build shock absorbing landing gear? I was even thinking of using air filled wheels mounted on spring loaded shocks.
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Knut Graf has some neat wheels to fit the 3DR legs (it looks like) http://diydrones.com/photo/arducopter-shock-wheels-4?context=user
This blog post used 3DR legs, some shocks, and wheels http://diydrones.com/profiles/blogs/3dr-quad-suspension
This blog post used another approach http://diydrones.com/profiles/blogs/shock-absorber
I admit to buying rubber balls but integrating them in to the stock legs...not yet implemented. To this end, I am sketching out parts for a truck shock loaded leg that will use the stock 3DR mounting.