It has not been a problem for anyone I know. It might not be perfect or beautiful, but I have yet to hear any suggestion for a replacement that has all the advantages of 9fat (simple, reliable, easily accessible from other systems, etc.)
I think "easily accessible from other systems" should be removed from the list. There are alternatives, such as booting a live cd. Many other operating systems also keep their kernels on native filesystems and do not suffer because of it.
uriel
Tim Newsham http://www.thenewsh.com/~newsham/