Konichiwa-
Most of the movies in the Kubrick set suffer from very poor transfers. Most noticeably bad is The Shining (an awesome movie though). It looks scarcely better than the VHS version. The Shining offers a supplemental documentary and there's an interview with Arthur C. Clarke on the 2001 disc but those are the only extra features in the entire set (aside from trailers). 2001 was remixed with a 5.1 soundtrack. The rest are in mono.
Aspect ratios are a whole other story. 2001 is the only one shot and transferred in a 2.35:1 aspect ratio. Unfortunately, it isn't anamorphic (none of the discs in the set is anamorphic) and has a dated transfer (although I actually think this is the best-looking of the set). Most of the other Kubrick films are presented full-frame (the way Kubrick shot them. He matted them for theatrical release). At least it's not P&S, but it also doesn't give us a chance to have them anamorphically enhanced.
Finally, the DVDs all come in snapper cases with no collectible booklets or anything. It is widely known that Kubrick himself oversaw and approved the set, but regardless, these movies all need new transfers with real supplements. Fortunately, I think there has been enough outcry (and DVD has really taken off since this set was released a year and a half ago) that in time all of the movies will be re-released. In fact, Dr. Strangelove has received a new transfer (although not anamorphic, unfortunately, because Kubrick varies the aspect ratio a few times throughout the film). It's a new digital transfer though and has some extra features. Release date is 2/27. In fact, I think that Warner has begun widescreen, anamorphic, digital transfers for all of the movies in the set. Those are preliminarily slated for release in the spring sometime. Looks like my Kubrick collection will be hitting e-bay once the new titles are announced.
If you're a die-hard Kubrick fan you could possibly find the set fairly cheap from e-bay or half.com. While I didn't necessarily like the transfers, I liked just having the movies on DVD. A Clockwork Orange is probably my favorite.
In any case, you can read a pretty good review of the set here:
http://www.dvdfile.com/software/review/dvd-video/kubrickcollection.htm
Well I've though of some others you might want to check out. If you're an Oliver Stone fan you might want to pick up either the 6 & 10 disc box sets just issued a couple of weeks ago. All of the movies will be available separately too. I'm going to pick and choose the Stone flicks that I liked--JFK, Any Given Sunday, the Doors, Wall Street, etc.
Also, there are a couple of awesome Hitchcock sets coming out. I don't know if you're a fan, but I can't get enough of his movies. I already have Vertigo, The Birds, and North By Northwest (already suggested to you). Vertigo will always be my favorite of his films, and it's a beautiful transfer too.
Finally I'll toss in a recommendation for the Kevin Smith movies. Dogma has a special edition coming out (it was actually supposed to be out this Tuesday but was delayed). Chasing Amy is another good Criterion (not the best transfer though) and Mallrats has some teriffic special features (multi-angle commentary!!!!). Dogma is getting the same treatment as Mallrats and will be a two-disc set when it finally does come out. Clerks is Clerks--nuff said.
OK, well that's enough for now. Hope that helps.
l2c