All Iahave ecver taken is the generic made by watson and I've never had a problem, but I have nothing to compare it to other than different muscle relaxers that were not effective. I've taken it for 6 years and haven't needed to increase my dose at all.
Like others have said, there are some generics worth avoiding but knwowing this forum, if somene had a problem with generic Soma, we would have heard about it.

It's not like if it's a little weaker you would exeperience withdrawal, so I don't see a reason not to try it.
JMO Dave