So far, I haven't encountered any undocumented or severe breakage when staying with the stable version. Of course, things are different if you pull from Git master, but that's to be expected...
I'm using the stable version. However, if I install on a new computer, I don't want to go with a year old version just to maintain compatibility with my other installs. And if I collaborate with someone else, it's unlikely they'll have the same version.