congratulations
You wont be disappointed the new Cats are awesome. As stated earlier there will be a learning curve to the new chassis. I came off a 16 and loved the Ascender instantly, but i did struggle for a few days from my M to the 14 pro climb. Enjoy your new ride. If i were making improvements it would be the following:
Canada sled parts steering bushing
Better front bumper
Knee pads. I really like how the new panel holds your knees in, where the old ones were always spreading them.
Vented side panels
Cooker can or LW one (not to loud please)
There are many other improvements out there the sky or your wallet is the limit. These are ones I would do after riding one for a couple days.