I have it installed on a lab box but I haven't had much opportunity to play with it. Here is what I can tell you:

1) Install is very smooth
2) Boot up times seem to be inline with a true Sun box
3) From what little playing I did, performance was not an issue (i.e. CDE loaded surprisingly fast)

The hardware platform I have it running on is:
Dell PowerEdge 1400
PIII 1.0 GHz
1 GIG of RAM
80 GB SCSI Drive (10k rpm)

Hope this helps!