Well after lots of tossing and turning and deliberating trying to make a decision on which tractor to purchase I have decided on an L4600HST. I will be going to pick it up on Thursday if all goes as planned. I was getting a little concerned about getting one before they start hanging all the environmentally friendly crap on em, so I pulled the trigger on the 4600. I do like the extendable control arms on the MX5100 though which made it a tough decision to make. Can they be added to an L4600??