I have used both and like the 7100i better. They do almost all of the same things (no Direct Connect on the 7130e), have the same stellar screen resolution, and are both very phone-like.
I didn't like the 7130e as much, though, since the keys are recessed into the keypad and it was more difficult to know that I was pressing the correct keys. I'm sure I could have gotten used to it if I used it longer, but that's just my 2 cents.
No longer a BES Admin, but it was fun while it lasted!