I would say this is a great phone for the price it comes at. I've had it for 6 months now, and it doesnt have to many problems.
I've noticed that when installing apps it lags a bunch, but other then that it seems to perform very well.
MY battery life is amazing, i can get a day and a half on battery, but thats also partly because i turn 3G off, since i dont use it much. I'll turn it on when i need or want to use 3G.
With 3G on all the time, my battery is about a day in good service, about 6-8 hours in bad service.
Call quality is great, sound quality for back speaker, awesome, and the phone is very well waterproof.
great phone, worth getting, cheap and who could beat the price?