Honestly, I think it's one of the most worthless things I've ever seen. Calling it "cruise control" is a farce....it's a throttle lock. Cruise control senses vehicle speed and adjusts throttle to maintain a set speed. This just holds your twist for you. So you'll lose speed up hills, and gain it going down. I thought a major point of cruise control was to avoid speeding tickets, which if anything this is going to earn you one as you go flying down a hill into a speed trap at 100mph, since that throttle position was only 75 on flats. The manufacturer touts you can easily adjust the "setting", but what's the point if you have to constantly "adjust" it? Just hold the damn thing and pocket the $200, IMO.
My Max came with a "crampbuster" thingy on the throttle....a clamp on "paddle" to rest against your palm. Hated it. Couldn't get a firm grip when things got exciting and just always seemed to be in the way. Took it off within a couple days. Probably still have it somewhere, it's yours if you want it. I've done 600 mile days with just the twist grip, no gizmos, and had no hand/wrist problems, even after about 300 miles of "spirited" riding holding it WOT or nearly so the whole time, and the rest cruising on the highway.
If you get a sore wrist from holding it, get a rider's wrist brace. I know Dennis Kirk sells them. Hell of a lot cheaper than $200 for an admittedly pretty, but worthless chunk of aluminum. A piece of duct tape would accomplish the same goal.