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.
One of the weird things, on paper so far, is the "silver age" X-Men coming to the present and having culture shock. IF you use Marvel's "ten year sliding scale" for their continuity, the original X-Men were likely formed in 2002.