I use a Dopod M700 which seems to have a slightly higher spec than your 577w..but I find the darn device a mite too slow. Cannot read a large Word Mobile file (compared to a IPAQ 2210 PDA I had). The camera even though it is touted to be 2 MP produces poor quality pics. Music is OK as it was built for that purpose as well as for viewing 3gp files. I have tried to tweek it but performance has been lousy. I only find that it functions well in making calls and SMS. Seems that you are able to use your device effectively.. congrats.  I'm thinking of getting a HTC Diamond..but waiting for comments on it.