I have never found a set of hair clippers or beard trimmers that didnt suck bad. So I kept buying the same old Conair POS from walmart and replacing it every year or so.
A friend of my wife is a hairdresser, and suggested the
Groom Pro set from Wahl. My wife said she saw them at Costco for $20 last week, but wasn't sure I still wanted them, so didn't pick them up so I can't say how good they are or not, but for $20 can't go wrong.