I've now got a Volspeed V3 on my other bike, this has also had the latest update, completed 20+ miles today no problem.
What I do find is the Volspeed V3 isn't as user friendly as the Speedbox 3.0, the Volspeed isn't as easy to set up as the Speedbox or as easy to activate/deactivate, as the Speedbox needs only a press of the "walk" button to switch on/off, whereas the Volspeed needs the minus button to be pressed for more than 3 seconds, which also means you're scrolling through the trip and odometer settings, but this is on the Purion display, it may be different on others?
The major advantage of the Volspeed is the lack of countdown when stationary, this has caught me out a few times with the Speedbox, when coming to a stop at lights or junction after a stint of more than 15mph

the Speedbox starts it's countdown which means when you set off again, there is a 1-2 second delay before the motor kicks in, feels like you're pulling off in in gear 8 or 9! this obviously doesn't happen with the Volspeed but I still can't get my head around the range estimation that it displays when activated.