Yesterday, I Ordered a myTouch 3G. Still trying to check out the reviews. As soon as I receive it, I will update you with my review.
T-Mobile My Touch 3G Android phone touchscreen is made by HTC and running on the Android operating system, Their products are used in Verizon and At & t phones as well. Over all HTC products have been pretty reliable in the past.
check out this site for a bit detailed review on myTouch 3G.