DS was skipped from 2nd to a gifted 4th grade math class a few months shy of the end of the school year. Academically he adjusted just fine. Socially he was never able to adjust; he felt too much pressure to perform. When he couldn't meet his own high expectations (and what he perceived to be the teacher's and his new classmates' expectations), he freaked out and got himself kicked out of the class.
This probably won't happen to you.
Just make sure you've got good communication with the teacher, so you're aware of how the class is going. No news is not necessarily good news.
