I think it's just for people who don't want to pay the massive price tag for the xbox one, but still want to get a new version. I personally won't be getting neither the slimmed down xbox 360 OR the xbox one (at least not until my husband graduates and starts making lots of moniez
) Which now that I think about it, it's only like two months after the xbox one comes out hahaha.
We actually had a first gen 360 for yeeeeears, no problems except for the tray sticking after a while if there wasnt a disc in, and barely upgraded to the new (well now old) one over christmas because my mother in law got it for us.