As for keepers, Cech is by far one of the best. I've used every keep in the PL, De Gea, Courtois, etc. I would say Cech is the best value for money. All goalkeepers have these screw up moments, that's a given this year, but other than those he is fantastic. His best trait is his reflexes, he played a huge role in my weekend league. He will save a 1v1 8/10 times if you call him out.
-One on One ability
-Occasional screw up (every goalkeeper does this)
I used Petr Cech various times, then i decided to let him face one entire week-end league to see what he was really able to do. Well, he saved me quite a lot, he's not De Gea, but he will not disappoint you if you give him a chance. He's a very good goalkeeper, reliable in the decisives moments of an important match, impressive handling, diving and reflexing are quite good, speed is a bit low so if you call him outside the goal he can't reach the ball very quickly, good 1v1 indeed. So, he helped me reaching 32 victories in the last week-end league, keeping the goal safe for some matches and being decisive in crucial moments when opponents often attacked, if you don't want to spend over 40k-50k for a goalkeeper, pick him, he's very good.