I've never had any real problems with the SSUs. 99.999% of users - who don't faff with bootmenu, SD-booting, random hacking of the system libraries (replacing Busybox, for example) - won't have problems either.

Remember two things:

1. People are more likely to post with problems than with "it worked"
2. The group posting here are self-selecting power users who are more likely to have tinkered under the hood, as above.