Gamesys is one of the very best looking bingo platforms around, and dare I say it, they come a very close second to tombola in my all-time favourite list.
I'm a user-experience man at heart, and the look and feel of all the Gamesys sites is always first class and they put a real effort into their community, with their chat moderators and how they communicate with players a particular specialiaty.
My only complaint is that there are not enough brands using it beyond the 'big two' of:
There are a few smaller brands using Gamesys on a white-label model, but they're not really worth mentioning as they're just Jackpotjoy in with a different logo slapped at the top.