Disklavier

Will be the proud owner next week of the MK4 and I have been trying to 
find out all I can in advance. This site has been very informative, but 
I was wondering  if there was another user group like the one that 
Yamaha discontinued or a MK4 owner.  I have talked to tech support at 
Yamaha a couple of times and 2  different  tech gave two totally 
opposite answers, so I m just trying to see if I can find an individual 
owner of the MK4 who would not mind answereing a few questions.  Just 
want more info on this very large investment (for me anyway)

Thanks