The V2 hub uses zwave plus, the latest generation of zwave. Some of the V1 hubs Are zwave plus, but the older ones, like mine, used the previous zwave generation.
Zwave plus is a big improvement over zwave in a number of technical areas, including range.
With my V1 hub, I had a lot of issues getting the correct status from my Zwave lock. Commands to lock or unlock did work, but status updates didn’t always get through, which was frustrating.
I ended up having to put a beaming repeater plugin module quite close to the door, just to get the signal to go around the corner.
Because we are rearranging some things in the house, I have a nightlight that I wanted to put on a Z wave plugin. But I’ve been putting off buying another one. So today, I had my techie aide over, and we decided, what the heck, we’d try moving the one we’ve been using as the door lock repeater into the other room and just see what happened.
And it worked! The V2 hub is able to communicate cleanly and clearly with my front door lock in one hop where the V1 hub was not. Excellent. 
