A lot of folks have commented on how Expedit is ideal for record collections, which I'm sure is true. I don't own any vinyl, but I still think the design is unmatched: the separate cubbies let you shelf a bunch of unrelated things while keeping them organized and tidy-looking, and the wide selection of fitted containers (shelves, drawers, bins) make it easy to store just about anything. My 5x5 is staggered like a checkerboard, alternating between books and everything else (tools, computer parts, clothes bins, toys...) and it makes a really nice effect.
It's also tremendously handy when you have to move. Make an addressing scheme for the shelf cubbies (upper left is A1, bottom left is E5...), get a bunch of small-size cardboard boxes from Lowe's or Home Depot, fill each box with one cubby (or two or three, whatever fits), and mark the box with the cubby number(s). Once you're moved in, it takes less than an hour to put everything back exactly where it came from.
It kinda sucks that the new ones won't match anymore, but I guess if I have to put them next to each other I can put some feet on the shorter one so the shelves at least line up. If they're discontinuing the 5x5, though, that really sucks. I'm passionate about organization, and nothing is as good as a large Expedit.