Just passed 501 this morning. I can't say the exam was hard, but it was a bit tough for me (non-native speaker) to decrypt what exactly was asked (aka best, least, most, etc). I had 83 questions, 4 PBQS which were relatively easy. Some questions were with a piece of code/log/acl matrix asking what's happening there or what to do with a given scenario. Maybe 2-3 questions about Linux terminal commands.
I have only used Professor Messer's videos and Gilson's book for studying, 2-4 hours per day for the last 3 weeks.
Good luck to everyone!