Hey! I figure I should start reviewing stuff, so I'll start with
this simple device that I've been using for quite a while now.
The GoCruise throttle lock is really easy to use and it works perfectly for me. Basically, you slip it over the throttle grip and tighten it down until there's friction. Then, when you're at speed, you use your index finger or off hand to push it forward until it contacts the brake lever. Once there, it'll hold the throttle at the same level until you roll off. Easy peasy!
I used to have a system like
this one and it worked nicely, but it took up a lot of room on the handlebar. On my last bike (Honda NC700) there just wasn't enough real estate available, so I changed to the GoCruise. After having used both, I like the GoCruise one better because a) it's simpler b) it's smaller and c) I can switch it from bike to bike in about 15 seconds.
The GoCruise is made of machined aluminum and comes with a rubber band you slip over the grip to keep from chewing up the grip. It works with or without the rubber band in place, though. It's quite sturdy and I expect it to last basically forever. I'll buy another even if it does wear out, just because I like it!
If you're looking for a simple throttle lock type cruise control for your motorcycle or ATV with twist grip throttle, I wholeheartedly recommend this one!