I am mostly quite pleased so far with Fusion 5 - everything seems to be working perfectly, except for mouse movement lag & sluggishness in some Unity windows. The degree of lag depends on the application. No lag whatsoever in Word and Excel, only slight lag in Outlook 2010 and IE9, but it is horrendous in Firefox 14, and so bad in AutoCAD LT2012 that AutoCAD is unusable. Until I find a resolution, I basically cannot use Unity. I did not have this issue with Fusion 4.
OS 10.8.1, Bootcamped Win7-64. I also have a couple of VMs of Windows server 2003 and 2008 - same issue. Updated VMtools ae installed in all VMs.
Any suggestions?