I got these shorts because they were on sale and I needed something to throw in the rotation for my louis garneau's. The sizing is the same as the LG's (except with Giordana you should size up..it's euro sizing) but the cut of the fabric is a lot different.
The Silverline's panels curve forward to accommodate your riding. If you're just standing off the bike or walking around they'll sag a bit (not too much) in the butt and such. Also the front is cut lower than the LG's.This concerned me but as soon as you get on the bike and get into position the panels straighten out and you're ready to go (and you're not buying shorts to walk around in are you?....don't lie...we know you wanna look cool ;)
The chamois is a little thinner than I'm used to but it is very smooth to the touch. The stitching is also superb (not to mention very attractive) inside and out. I don't know about durability yet but they definitely look like they'll hold up a long time.
In conclusion, these are one of the better middle of the line shorts and I would recommend them to anyone looking for another pair for their rotation. They won't do you wrong.