I know this thread is about 3 years old as I write this but since I own a X534 with snowblower I thought I would answer.
I bought my x534 in 2010 with the 47" snowblower, chains, and 2 42# suitcase weights and other attachments for mowing.
That next winter we had significant snow for our region PA/DE/NJ with over 60 inches of snow that season, most of it coming in 2 big dumps of >20 inches.
The x524 and snowblower performed very well. At first I did not use the chains but when I went to help a neighbor whose drive has a fairly steep rise of ~4.5 feet over a 50 foor run I could not run the snowblower up the incline. I could drive up there if the snowblower was dis-engaged and raised but not if I was trying to blow snow. Downhill of course no problem. I went to mount the chains (still sealed in the canvas bag) I had bought 8 months earlier only to find that the dealer had given me the wrong size chains. So once I got back to the dealer and swapped them out for the correct size chains I had no trouble on the incline.
The snowblower ate right through snow as deep as the height of the snowblower and threw it off to the side about 20 feet. It is the best attachment I bought for the x534 I think. I had considered buying a walk-behind which would have cost a few hundred less but I am so glad I didn't. This is much faster and easier and with twice the width I can clear my 60 foot long, 25 foot wide drive in about 6 or 7 passes which gives me plenty of time to do a couple neighbors drives adn still be done in under an hour.
As far as the belt drive it is in my opinion the weak point of the snowblower. I would much prefer a mechanical drive I think. In my case because of the type of curb we have I need to remember to disengage the PTO before driving up the driveway from the street. This is bacause with the snowblower running and the limited lift (about 4") of the snowblower the front of the snowblower will contact the curb pushing it up higher and causing the pulleys to become so misaligned that the belt runs off the driven pulley. Now you have to stop, shut the tractor off, and reinstall the belt. Takes about 3 or 4 minutes. As far as slippage I have not noticed any degraded performace because of the belt drive.
I did contact JD about a suggested improvement to the chute control cable and described what I consider a design flaw in the cable routing but never heard back from them. Its a simple fix for the cable getting hung up when you rotate the chute. Their method of securing the cable can be improved to eliminate the problem which I did for about $1 worth of hardware. If anyone expierences this problem let me know and I will detail how I fixed it.