There's a Fantastic Four set coming out as well, I think either this month or next month. I have the Spider-Man one. The scanning is pretty well done. It's all in PDF. Obviously the oldest issues are not as crisp because they're scanned from someone's collection (the set says who but I don't recall)... newest stuff is of course great-looking. I imagine the FF set will be very similar.
I would not read the Ultimate line for years until I slowly lost interest in the direction pf the majority of 616, and wanted something different. So I devoured the trades and back issues to get caught up, and now I read them all except Ult. Fant.