An after-Cebit meeting today was attended by a NEC technician and we had a couple of drinks while discussing a few issues. Somehow I remembered your request here and here we go:
SS610 neither in W2K (perhaps dodgy but most probably not at all) and in no way for XP. Last driver issued is about 6 years old, workes properly in all DOS and Windows versions up to 98 (as long as the printing side can access the DOS platform) but never ever in a real 32 bit environment....
Signetis advise is the one to follow....