castlerobber
Zen MBB Master
I found this thread last year when I was having chain drops on my Q451. Between adding the Jumpstop, and having the rear derailleur cable replaced because the RD wouldn't stay adjusted for more than a couple of weeks, I haven't dropped the chain in months.Well, it's been 2 years now, and not a single chain drop once I installed the Jumpstop.
And it looks like an original part of the bike. Very happy with it, and recommend it to anyone having chain drops. One less thing to worry about.