Certainly are good, use mine all the time now after selling my 7D
Bit prone to sensor/viewfinder dust, but the end result is excellent and enjoy the simplicity of using it. File sizes aren't too big either and 8gb card gives about 400 RAW and jpegs.
Mirror lock up is buried in the menu so got mine saved on the one custom setting along with a few other favourites.
The later ones with a serial number beginning with two are supposed to have a better LCD. Not seen an earlier one to compare, but that seems to be the general consensus of users, battery lasts for ages too.
Not had the mirror fix done on mine, getting on for 20,000 clicks and alls well although I believe it's still available free from Canon