I see Citibank is offering a 5.0% money market account. I currently get 4.25% through ING, and the interest rate difference is nothing to sneeze at...

There are some Citibank ATMs around too, which would make my money more accessible unlike ING which is solely online.

Does anyone have any experience with this account? I already have a credit card with citibank and have been very happy with their customer service so I suspect I won't have any problems if I do have questions at some point.