I have two types, one is the IKEA one above and we have another with a plate that helps reverse the leftover bits out, but I still rarely use them.
(I have also bought the chopped garlic in jars but they taste very vinegary to me...)
Peeling a clove still needs doing, then cutting into two or three bits and slicing into small chunks takes about 30 seconds.
If I have accidentally overbought garlic I now chop a bulb or two up in one go, and freeze in tupperware. Cooks from frozen and don't have annoying garlic press to clean out.