100% vg is like 100% pg with less of a throat hit and vapour that sticks around until the next apolcalypse. That's about it. Worst aspect is finding tank systems that work with it because let's face it, dripping feel like a chore the 50th time you do it and it's not exactly hugely portable.
I use a CE2 with a cut or upside down inner seal as my tank setup. I do use 808 cartos on my volt, and it is an alright vape but it's not as good as a CE2. It does wick fine in my 808 cartos but they really suck for having to replace them once a week with severely moderate use seeing as I barely even use my volt. I've yet to find another tank type setup that actually wicks vg.
On a sidenote, boge cartos utterly suck to fill with vg because the wadding inside is denser and it takes half the night to fill one properly.