My DD is in the first week of a 2nd -> 4th grade skip. So far, so good (God willing, long may it last).
I searched high and low for negative cases and didn't really find any. This site has a lot of useful information as does Hoagie's. The clincher for me was doing the IOWA scale assessment which takes a number of variables into account and finding that DD was a prime candidate for the skip beyond just the academics. I for one really needed to be convinced that it was a safe thing to try. I cannot say for sure that this has or hasn't 'worked for the better' but DD is very positive thus far...
