I just got my Mondo pre paid card last Thursday (I am part of the alpha, somehow). I tend to see the App + Card integration as quite nice because instead of you looking at your money like a statement, you start to think of it like a dashboard instead, constantly updating to reflect the most recent changes in your situation.

It is weird that transactions for the underground start as 20p then randomly increase to £2.30 (or whatever).

As a computer person I quite like seeing the detail of what's going on with the clearing process. In the end I think Mondo want to be more mainstream than for a geek like me (i.e. they removed custom tagging - I wanted to do things like add tags for when corner shops rip you off and charge you 50p for using your card)!

The API for their bank looks promising though so if you don't like it you can just treat them as an API and consolidate everything yourself, maybe.

BTW. Thanks for Flask, I use it every day and it's excellent :-)