I'm not very familiar with them. Too "pop" for my tastes, generally. But what I've heard wasn't bad by any means. Very good production and craftmanship, just not the sort of style the compels me to buy albums.
My favorites among the better-known bands are Yes, Genesis, and Rush (Kansas is up there too) and there are a bunch of less-known that I really like. Mark Spritzler and I could probably debate the merits of all sorts of albums in this genre, though I don't know that that would be of interest to anyone else here.