I've been looking for a banking tool like this for ages, and I can't express how happy I am with the free structure (free) and transparency into how that works (the float as compared to Mint's ad supported model).
The iOS app is amazing, everything has been great so far. Had a few questions and called customer support today and spoke to Ryan in Portland and he was able to both help me with my questions and explain the whys and hows behind what is currently available and what is coming down the pipe. Never in my life have I had an API conversation with a financial services representative. I'm very impressed - no complaints here.
I have been with simple four a couple of months now and I am happy for the most part with my experience. The one thing that really drives me crazy is that they don't allow you to write your own checks. I am smart to know why its setup that way and the limitations they have from being on-line based. You process the request for a check on the app or on the site it instantly pulls the money out of your account (which i really like) and it arrives in the mail. They use an external processing company to send you (or your payee) the check. It normally takes them two days of processing a couple days to mail it and then your check lies at the mercy of the infamous USPS. I'm averaging 12 days between requesting a check and receiving it. It's just too long of a process, and i would have known about these types of delays i'm not sure I would have signed up. Checks should arrive within 48 hours anywhere in the US. They should also provide another way for you to receive a check if you need one at a moments notice (buying a car, or lending someone money). I certainly wouldn't mind paying a fee to have an option to have one overnight-ed to me. I gave up on requesting checks from them and use my local bank to handle my checking. I love simple, i love the customer service, the app, everything... everything except this check system. They have to add some flexibility to this process to make it my one and only checking account.
Well, that was disappointing. After I signed up, gave them my social, bank info to deposit, and birthday, they emailed me a letter saying my application was denied. What a way to get all my information. What a scam!