Master Locks are fun. My wife and I recently started the tradition of her buying me a new and different lock every holiday. To start the tradition was a twin pack of Master No. 3's. They are definitely a confidence booster, they're the easiest lock I've picked (on par with filing cabinet locks, I guess) but when you start them out you can hit the warding if you're not careful.
Yesterday I picked a Master Combination lock (donated and previously in-use by previous owner), fun lock to pick. Had to turn the plug pretty hard once picked notwithstanding I was using a Peterson Prybar. Also, seems the plug only turns in one direction. Yesterday I also picked a 3-pin setup: Bump Halt, spoorated and serrated top-pins. They were fun, but the Bump Halt spring really wears me out and was tough on my government steel reach. Also handfiled two keys, one of them so that if I put a mix of security pins that are two tough into my lock, I'll be able to back-pedal.
Today I failed at extracting a key from a relatives truck door, really tanked my morale since I am usually good at this, thinking of getting the Peterson extractor pliers or another key extractor (the key seemed to wiggle around in the lock a lot.)
Just got done impressioning an Abus 83/45 with Bump Halt installed using a nickel plated blank (came with the lock

); went like a charm, helped me get my morale back. I love impressioning!