Seams seem to be the biggest problem. Where they're placed on the counter is important and the underlying supporting structure is too.
We don't have them but in my house, the kitchen is where everyone hangs out. (It's a good size kitchen.) With that, there's lot of leaning on the countertop. From what I've been told, it's somewhat cold to lean on too! (Isn't that somethin' ...)
What I'm about to add aren't really negatives. Just FYIs ... Corian is water and stain-resistant! It's not to be used as a cutting surface as they will show cuts and scratches. And it's not a landing pad for hot pots and pans. (Save your corian scraps for cutting-boards and hot-plates, and have them cut into fancy shapes like hearts, squares, clovers, etc., etc. There will be scraps from the job so talk to your contractor.)