Just did a runthrough of the DS version. Loved it. This game definitely isn't a hopeless wannabe like the Wii/PS2 Unleashed. It stands apart from the Wii version and is wonderful for it- the level design is excellent and I didn't come across a single bottomless pit up until the boss arena for Aquarium Park. Boss-wise this game just tears its console counterpart a new one- they're all unique and incorporate Wisps in cool ways. In fact, I would say the DS' counterpart for the Wii final boss is superior- it's more difficult and varied in its attacks. I was a bit worried about the Wisps' apparent mandatory-ness, and even though they are often required for use (though don't get me wrong- there's a bunch of optional paths that involve them as well), they're really fun add a lot of flavor to the game. All in all I would say that I prefer this game to the Rush titles, though I do have a few nitpicks. The wall-jump is handled downright stupidly, and is completely situational for no damn reason other than to gimp you. It's only possible to use it in specific areas, even though it would often help to be able to use it elsewhere. I also have no idea why they bothered to implement the slide move and the areas that require them- the former is offensively useless with the spin in mind, and the latter are pretty much impossible to see coming in a 2D game. But yeah, great game. Skipped all the cutscenes since I couldn't stand the dopey music though. EDIT: Just got all the emeralds and fought the bonus boss. Yeah, it's an ass-pull, but I liked the fight. It's pretty cool how it goes all 3D on you- that's a first for a portable Super Sonic fight. Also, like Sonic 4, you can restart a special stage before you lose it.