I have dabbled with JBV1. I am just not sure I need all that. I want a Ka Brap, Brap. All the rest is fluff.
I DO like that I can configure the V1G2 via JBV1. I do run JBV1 on occasion when I'm going somewhere new, since the arrows overlay Waze. For my normal commute, it's not on.
I've had a V1 since 1995. I feel naked without it.
Waze is great and all, but the combo of the two is best. I usually fire up Waze on the way home from work and if it tells me to go 208, I turn it back off and go 208. If it tells me RT80, it means 208 is a sheetshow and I leave it on. The V1 is always on.