You saved 10% over the cost of getting it direct from Apple, which is about as good as you can hope for. The warranty is also cheaper (I think) but I wonder what it covers.
Nothing you really need to be aware of. It and the 3 are about equal* (really, at the end of the day) in terms of everything except that the 3 has more RAM, which helps with browsing and whatnot.
*I mean, obviously the screens aren't, but otherwise...