I don't know if anyone said it was better, it is different though. I prefer not having emails threaded, but each person is different. Skaffe offers a Calendar, external mail download, etc.
And, you don't have to be invited to sign up like Gmail is. 200 MB attachments compared to Google's 10 isn't bad either. I like to root for the little guy though. I was saddened to see G go IPO.
I've only just tried it, so I'll have to test it further.