O.K., so... I have heard of this new version of Garry's Mod 13 while playing Garry's Mod 10, and im not to happy with what I have seen so far.

There takeing Sandbox mode out of Garry's Mod!!!!! Sandbox is the reason I bought the game! Im definatly Not recommending Garry's Mod 13 to ANYONE!! Im very dissapointed with this news. Anyone who might agree with my statement, please leave a comment. Thanks ( but not to Garry's Mod ! )

They aren't taking it out and toybox is just being replaced with steam workshop. Also for game modes breaking, Garry newman actually left something on his blog which told people why their addons will break and gave them an easy way to make it work with gmod 13. Personally I don't see why people are up in arms about it.