If you plan on bagging the clippings, one thing that concerns me about the new JD riders is the attachment points for the bagger. They're just holes in the plastic body with black plastic inserts to strengthen them. The new attachment system looks awfully flimsy to me. My 10 year old LT150 has substantial round tubing that fits into a bracket and is secured with big metal clip pins. Basically a weld would have to break somewhere for the bagger to fail. I have not actually seen a bagger attached to the new mowers, but I just don't see that strength in the new system. As far as getting 3 to 5 years out of a D110, I think that's a little pessemistic. The same was being said about my LT150 that was being sold by HD and its 10 years now and going strong. I decided to support my local servicing JD dealer over HD since the price was the same.
Sorry, I meant this as a response to another JD post, but I guess its just as relevent here.