a quick iRebound:
experience would suggest yes. just because you buy a '67 mustang in '68, then change your mind, don't mean you get a '68 for free.
but software is slightly different i suppose: if the people who sold it to you knew 9.1 was already available and didn't tell you just so they could clear their stock, well ... they're not worth dealing with.
on a brighter note: 904 is a rock solid OS and from what i hear, you're not missing much anyway.
[This message has been edited by posthumanus (edited 01-14-2001).]