I have a new JD X584 with about 30 hrs. of operation, 48" deck with mulch attachment in the deck.....does an excellent job of mulching and blowing out the side. I have only one complaint......the hydraulic system is slow to react. I can activate to raise the deck (on the go while mowing), and it doesn't raise until I have traveled another 3-5 ft. I usually mow at approx. 3-6 mph....depending on grass conditions. This is way too slow when you need to get the deck raised quite fast for any reason. I have not been to dealer with this complaint yet, but before I do I am wondering if anyone has had this same problem.