Pros
There are some very nice projects, you can build up a nice demoreel. There are really nice people you can work with. Prague is very beautiful and cheap city. Lots of cheap and tasty bear, occasionally nice food. The studio location is also very nice, and easy for commute. Very close to city center by tram. Lots of restaurants and bars around for lunchtime.
Cons
I didn't stay too much for overtime, but film department does a lot of overtime and full working weekends. Overtime is paid, yet it is x1 your hourly rate. Pipeline is old. The communication is not so good between departments. They try to hire people from abroad, yet they leave them without notice after a test period. As it's mentioned here before, they say "co-operation works, but there are not as many projects right now. so goodbye, maybe we can work in the future". This is not good if you believe them to come to Prague and and then get laid off after a short while. Try here if you have no other options.