I really like Eureka it may be awhile before I get to see season 2 though as it won't air here til the fall.
As for the holder I don't mind it as they seem to stay in with my copy. Discs 2 and 3 go in pretty tightly (but not overly tight) while Disc 1 is not as snug but it doesn't come out...
I just bought, returned and exchanged for a good copy of Stargate SG-1: Season 8, for some reason the first copy has a season 3 disc instead of a season 8 disc. This is the slim editions of course.
I remember reading about the Threads episode being in 2 versions what it the right length?