Singular Sounds are fantastic at making fantastic products, good build and a pleasure to use.
Feature - exactly what it says on the tin and I would give it 5* for being a midi controller, but lacking is the custom mode ....I find Singular Sounds products a pain in the butt to customise and the Midi Maestro is no exception. By product comparison they are up there with the best, the likes of Roland, they are BOSS!, but when it comes to programming they could learn a few things from Roland (exceptionally used friendly products). The Beat Buddy is easily the best compact drum machine on the market but I have to leave it stock as I haven't the patience to jump through programming hoops.
Although Singular Sounds employees are scientists who build exceptional products for scientists, they need to understand that their demographic reaches aging rock starts with a cafuddled brain (lol). The combination of Beat Buddy, Aeros, and Midi Maestro cannot be beaten IMHO, I wouldn't swap them for ANYTHING!