Yep, I've been using them for over a year now. They are FDIC insured. They can offer the better rates (2.10%) because all of their business is on-line. I just have them linked to my regular checking account & move money back & forth. I have never had any problems with them and can't see parking my liquid money anywhere else.
Also, if you know anyone who has an account with them you can get a free $25 just for signing up. All you have to deposit to get the free $25 is $1. I signed up all 3 of my kids and they each got a free $25 in their savings accounts as well.
Hope this helps. I'm sure you won't be disappointed with them.