Not sure what they’re selling for currently, but the V3 is a big improvement and worth the extra $ imho … especially considering it’s a one time purchase, and not a continuing annual subscription.
You also get free course updates, watch firmware updates and very responsive customer support.
As others have mentioned it’s requires very little interaction during play - only the “Pin Collect”, a 1 button function - to mark the location of the pin plus your total # of putts.
Very accurate gps distances to greens and hazards.
You also get lots of stats and analyses … including Strokes Gained for different facets of your game - and you can switch comparisons to different handicap levels … in both the smartphone app and the web-based “Dashboard”.