I'm actually one of the odd-balls running 2.1.5 on my glo, along with the plugin from ikarus9999
I think when 2.2.X came out, it broke something for me, so I reverted back. Then for a while, I just didn't see any new features I thought worth upgrading for... and now, I can't decide if I want to mess with figuring out which of the various plugins/tweaks etc I want to install, and the hassle if I decide to revert back.