Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad design

While the concept of the built in comb is a good one, this design just does not work well and don't count on the vacuum catching all your clippings because it can only hold about half the volume of a shot glass. I ended throwing mine away and switching back to my old Oster hair clippers with the snap on combs for my head and bought a small rechargeable Waring beard trimmer. The twist dial for the comb length on this unit can be wrong - I gouged my beard/sideburns once with this unit. The comb unit must be removed for frequent cleaning and putting it back on correctly takes a delicate touch. The large size of the unit and comb also makes it verr difficult to trim your moustache close to your nose. Don't waste your money.