I switched to Hardcovers for the Ultimate line and got the last two Ultimate Spidey ones, the last Ultimate X-men one and the first two volumes of UFF (I also brought Ultimates Vol1 as well, had the singles, but hadn't been able to read them all at once as it took way too long to come out and I couldn't keep them together).
I think they look better, and are actually cheaper than buying singles or trades.
However at the shop the other day I saw a new Ultimate Spiderman HC, and also a HC collecting only six issues of the Clone Saga.
Will this be re-released in a 12 issue HC or is Marvel switching to six issue HC's?
Personally I'll be dissapointed if they switch to six issue HC's as it will make the HC's more expensive for me, and I'll have to switch back to trades, and probably end up dropping Ultimate Spiderman, as it's only by reading two storyllines in a row that I get the feeling that anything has happened in the title.