I loved v8.5p++. That was a very sweet program.
As great as it was however the current versions blow it out of the water.
The ability to Stitch splines alone is well worth the upgrade.
Add in the other features and you've got even more reason.
I've been using A:M v14 (and now v15) on Vista for months now.
Intially I had problems with the graphics card. A few months later and an with an updated driver the problems were gone.
Vista's main issues for me are unrelated to A:M.
I've not had an OS crash on me this often... ever. Dispite the problems though I find I like Vista enough to keep it.
Like Fuchur though I suggest Windows XP for absolute best performance.
If Microsoft issues a new update I'll reevaluation that recommendation.
I'm sure the primary reason is that my laptop is running on only 1GB of RAM.
As long as you are running at least 2GB you should be fine.
Watch out for your graphics card though... I have refresh problems occasionally in several other programs.
Interestingly enough however I no longer have them with A:M.
I ran v8.5 on Vista about 6 months ago. I still love that version but cannot return.