i have no major problems with the mytouch. running Froyo on it and the phone itself is pretty fast even with a bunch of apps on it. much better than when it was stock 1.6
cant complain about speed either. data connection gives me about 3Mbps downloads so im able to get my music, podcasts, and youtube vids fairly quickly.
i kinda wish people who complain about this phone would give thorough explanations as to what exactly is wrong with it. there could be a software issue causing it to perform less than normal or a defect that needs to be brought to the attention of T-Mobile....