It is very hard to get me to rate anything with 5 stars. The customer service I received today is what put this over the too.
I tried this out and found there were some things that annoyed me - specifically that the app did not default to the number pad when entering credit card numbers. I sent a quick email to their support, and within an hour on a Saturday evening, I got an email explaining how to edit the app to my liking.
This sort of fast service (and an answer that didn't make me feel stupid) is what will make me a loyal customer.
As for the app itself, it is a very easy interface, highly intuitive, and Very Easy to customize for your own taste. I'm glad I picked this up.