Order #241 in! We'll see how this works on an RC51. I've got the Go-cruise now and I've been careful to not over-stretch it when taking it off and on. My biggest complaint was that it wouldn't always grip enough to maintain a throttle position even with the band installed. I reinforced the plastic with zip-ties through it, which helped, but I still had to keep a little pressure on the throttle to maintain speed.
I'll post back with pics and experiences after it shows...