I have to say the app is just amazing, none of the traditional banks even come close to what Monzo provide. There is nothing overly complex to it - but it just works. Shows you things you would expect a bank to be able to show you, for example the name of the shop where you made a purchase and it's location. Rather than some random name of a parent company.
Sending money to friends has also become so easy now, I make Monzo to Monzo payments on a weekly basis it just works.
I've heard they're great to work for too. Would be interested in working there myself one day.