Iv got a Knock on Hand capper, it just come with my fermenter kit from GG,
Now i like it BUT! the only reason i think i like it is the fact i use a Nylothane Plastic Sheety's mallet to put them on with, its well weighted and is perfrct for the job, however its worth about $60, just so happens that iv got it in my work tool kit i'd be scared to use a normal hammer with it.
However when i decide if im going to keg or not..... i will either get rid of bottles or buy a good bench capper like this one