http://www.camaro5.com/forums/showth...=1st+2nd+shift
Lots of results in this thread.
I had the same problem with my brother's v6 the first time I drove it. The tranny was cold and I missed 2nd and heard that horrible grinding sound (I assume this is similar to what you're experiencing, it's just rough to shift even if you don't get that noise).
I haven't drove his car much since, but my SS has about 22k miles on it and I picked it up when it had about 12k on it. I never had too many issues unless the tranny was cold. I think it's generally just part of the break in process, is yours worse when the tranny hasn't gotten warm?