Hi, I'm looking for any opinions on the canon 28-90 4-5.6 USM lens. I've decided to upgrade from an old Rebel XS to an Elan7 and have been looking at the USM lens. I currantly have a sigma 28-90 3.5-5.6 macro lens. It does the job decent and I don't have any real problems with it. I know the USM is supposed to be quieter and faster but I don't have any experiance with one and sadly there is no camera store close to where I live so I can't go and handle one myself. Any thoughts will be appriciated Thanks!