The store is definitely pretty with CD cover art for all musicians. It's also informative on the song choices; the previously known ability to preview songs and see difficulty ratings for individual instruments is a major plus. Purchasing songs is quick and easy.
Those are the good parts, but some things are not that great. For example, songs can't be bought in a batch like on the PSN, and must be bought individually (unless you're buying an artist pack). Unfortunately, to play your freshly downloaded songs, you'll still have to exit the game and install the tracks on your PS3. While the latter criticism is something we didn't expect to happen anyway, it does make the swiftness of an in-game store a tad cumbersome. In short, the store is good at driving a sale; it just needs to work on getting those tracks integrated quicker. That was the whole point of the store, was it not?
[Update: Just to clarify, the game does install tracks, but only when you download songs one at a time and if you wait until the song fully downloads. If you choose to 'perform in the background' and/or proceed to get more songs, you'll have to install manually and exit the game.]
