I have it on my new x500 and after the first cut I tried it and all it did was make a big mess and took off nothing and that was on a brand new deck. That was the first and last time I use it. Neat idea but IMHO it is not worth it.What is the opinion regarding the deck wash systems the new decks have on them? Does it clean the bottom very well? I am thinking about putting one on my 54" deck on my 455 which has a mulcher kit on it. If it doesn't clean it well I would think you will just have very wet grass clippings under the deck which would create rust. My next concern would be water in the bearings.