I just finished using one of these chains. It was good at first - almost no kick-back at all, ever - although no good for plunge cuts as a consequence. However, it didn't last long. I took some chains into the local hardware store while this was still quite new & the owner warned me this chain would not take a second pro sharpening! (It was my newest chain at the time too).
While this chain has big safe guard links, it has ridiculously short cutters - which means there isn't much metal there that can be file away by sharpening. Towards the end of its relatively life, the chain cut very poorly - probably something to do with those honking great guard links getting in the way.
A good safe chain but not a great chain overall, the cutters are way too short so it doesn't stand up to frequent/heavy use. No good for plunge cuts. Definitely aimed at occasional home users, beginners and timid/safety conscious users - for which it is very good (but not perfect - definitely room for improvement).
I prefer the 91 VXL - it doesn't have all the safety features of the 91 VG but it cuts great and has extra long cutters.