Pros
Really awesome team, great manager, semi-pro foosball table (chosen by me), semi-flexible working hours and a very friendly atmosphere. As a part of your job you'll also be asked to travel to various conferences around Europe, which was always an amazing and fun experience. The only reason I left was my greediness as I was offered more money somewhere else - it wasn't an easy decision though... All in all, I can only recommend this place.
Cons
Not possible to work from home. The internet is rather slow (due to some security reasons). Some of their products are a bit outdated (however, I think they're already working on their redesign).