I'm not sure either, but we did get the one that has steam, night wash (you can actually wash a few pieces at night and they will also dry overnight - don't ask me how this works, but it does

) Some people complain of smells, mildew, etc. but I have never had a problem. I always leave my door open some to let it air out, but have always done that anyway. They have cleaners, but I have never needed to use one. If I ever needed anything, would just run an empty wash with some vinegar or bleach, but doubt I'll ever do that because have never had an issue. We got the nicer model around black Friday at Lowes because we got an excellent deal on it. Love the large capacity - can easily wash comforters, sleeping bags, etc. I have a friend that got an LG and she has had nothing but trouble - water not emptying out completely, sour smells, etc. Just love my FL Samsung could do a commercial for them LOL