I have the Sentry LX.
Pros: independently controls 7 fans (or more if u plug extra converters in, then controls the fans on that line), looks pretty, doesnt make beeps!, has 5 temp sensors which can be used to control the fans, there is room behind it to stick a fan as it isnt very deep, i prefer it to the knob controlled ones as nothing sticks out past the case.
Cons: Viewing angles are really poor, takes up 2 bays which could be an issue if u hav a reservoir there too.
Tbh the beeps wont annoy u after day three or four cos by then u'll have it set up how u like it and u wont need to touch again unless the battery runs out.