Got my xbox 360 S in and that hard drive case worked out great! Was very easy to get the drive from my old 360 into it and it worked perfectly. Only thing was that the license transfer was way more of a pain then I realized. You have to redownload everything (though it really only seems to download the license), one download at a time. Took way longer then it should have. Also the website was confusing. I had to look at the license transfer FAQ to find out how to actually download the licenses - it seemed to say it would happen automatically, but that's not really how it worked. They really need to improve the process and make it one-click easy. Oh well. I do like the slim a lot.
EDIT: I do have one disappointment with the 360 S, and it isn't entirely insignificant. It really doesn't seem to be any quieter then my Jasper Elite. Microsoft described the new 360 as "whisper quiet". It is in no way shape or form "whisper quiet" (unlike the Wii, which *is*) and that was one of the reasons I bought it, so that's pretty disappointing. Maybe the optical drive is quieter - I haven't tried playing anything from it yet, but I generally install disc games, and play a lot of arcade/indie games. You hear the fan rushing just like the Jasper. It is smaller, has more USB ports, dedicated Kinect port and built-in 802.11n wifi (which saves another USB port and I can have my flash drive plugged into the back of it), so I'm still pretty happy with it anyway, but it's not exactly all I was hoping it would be. Oh well. I'll definitely keep it and trade in the jasper. I like that the 4 GB model is matte black. It looks nice and won't be a finger print magnet. They should make the other model matte too.