I have talked to a couple of guys that have those Harbor Freight winches, and they all say they work just fine.
They are kinda big, and heavy though... but all in all I think they are worth it.
I have a 3000 lb Warn ATV winch that I thought of installing behind the bumper on my Kick, and just use it with a snatch block... I still don't feel that is enough pulling power for any hard core winching, but I bet it'd pull me out of mud holes and such.. the thing about the atv winches is that they don't have a lot of cable in them... especially doubled with a snatch block.
I really wish someone would make a nice compact 5-6 thousand pound winch, I think that would be perfect for sammys and kicks. I know Warn makes a 6K, but I want a smaller winch, and lighter.... oh well...
Another thing about those Harbor Freight winches... they are IDENTICAL to one of the larger manufacturers winches.. I think it is Milemarker, I could be wrong, but someone told me that the same plant in China makes both, and labels them for each company.