I had a Go Cruise. I did not like it at all. Was seriously thinking about doing the full -blown car cruise control, but wanted to wait until Winter, so I didn't miss any riding weather. The Go Cruise was pretty useless, it was so cumbersome, that I rarely even used it.
I read good things about the Vista Cruise & decided to try it until the Winter. I installed it at the same time I added Tusk grip heaters & foam grips. I couldn't be happier. I wasn't expecting much, as it basically works as the same principal as the Go Cruise. However, the Vista Cruise FAR exceeds my experience with the Go Cruise. It is so good that I am no longer considering doing the real cruise control.
I have the Go Cruise on another bike now. It does work well enough if you just need to stretch your right arm, but requires more dexterity than I possess to use it very often.
The problem with any of these type throttle locks is they have to be constantly "tweaked" to maintain a constant speed unless the road has zero changes in grade. That is what seperates Vista Cruise from Go Cruise. Small adjustments to keep a constant speed are very easy & precise with the Vista.
BTW - I have no experience with the NEP.