Xray2, congrats on the new purchase. It is an amazing instrument. I bought the Motif XF8(WH) a couple years ago. I decided on the XF8 because my previous master keyboard was the Korg Triton but found myself mostly going to my Motif Rack for patches. So moving to the XF8 as an upgrade was a no-brainer. Secondly, I found the expressiveness of the weighted keys to be far and above the competition's. The one issue I've had with the XF8 is never being able to take advantage of the DAW controller functions. It has been a huge frustration for me as I tried to follow Yamaha's instructions which seemed to be too vague and Sonar didn't have anything for this specific instrument.
I do plan to eventually upgrade to the Montage 8 though. If you have already been able to take advantage of the Montage to provide some level of DAW control, could you let us know how easy/difficult is was? Also, if you are able to find instrument definitions, it would be great if you could post a link here. Thanks!