I did a lot of investigation on various forums to determine which one to buy and I couldn't decide . So I bought both models that I was interested in
(NEP CC4 & Vista Cruise Universal for 7/8" handlebars)
Because I had heated grips I think the Vista Cruise would have been a little more difficult to install. It had more pieces and was more complex in its appearance. Also the fact that part of it installed over the throttle giving your hand less wiggle room. I liked the fact that the NEP could be installed between the grip and the brake reservoir "stuff" (<-- technical term) .
(NEP CC4)
The NEP is so simple even a dummy could do it. Basically it is just 2 split rings held together by a brace and a small flange to hook onto your throttle return line to stop it from spinning, and a lever to "set" the throttle, with a set screw to adjust the friction.
Here it is shown with the supplied allen key
In Jack riepe terms it is like a blonde with long bowed legs which wrap around the flange on your throttle to stop it from spinning, held in place by friction. The set screw applies pressure to the "clamping action" to keep the throttle spring from returning, but loose enough to allow you to still move the throttle to the desired positon while "locked". You depress the lever to SET and flick it back to RELEASE .
It mounts left of the throttle and grabs onto that lip
Like a split ring it is easy to put into position
It is very thin and made of some sort of plastic or polycarbonate, or blend
The SET lever is slotted which slips over the two halves
There is a little flange on the right which slips over the throttle tube, and stops the NEP CC4 from rotating
here's a closer view of that little flange tab. If the NEP CC4 rotates then you cannot lock your throttle and you cannot lock your speed. On some bikes you have to drill a small hole and use Zip Straps to secure so some other point.
Here it is, all installed and ready for action
(NEP CC4 , V-Strom DL650A K9)
TO SET: get to cruising speed, push DOWN on lever to lock throttle
To RELEASE: push UP
To make fine adjustments, just turn throttle to desired position. The friction zone of the set screw should allow you to do this. ie: to increase speed while going uphill, or decrease speed while going downhill. Remember this is a throttle lock and NOT a cruise control