I have a little over 50 hours on my 45DA, and it has been great. The design and layout are the best IMO. Equipped with FEL, loaded R4s, and 6' box scraper, I have done mostly earthwork so far. It's been so effective, I've decided to order the BH. In addition to digging some serious holes, I am looking forward to getting some more implements so I can do a bunch of fence work and prepare a 5 acre site for planting a vineyard. The tractor seems well suited for anything and everything.
Doug's comment about the procedure for switching out of 4WD is spot on. I do the same thing (i.e., lift the front up with the FEL before moving the lever out of the 4WD position).