I have one fitted. I also use the Touratech GPS mount. Ive had no vibration trouble with the Zumo. The Adjustable mount seems well made, but the adjustment knobs come lose on rough tracks. I had to hold the handle bar with one hand while tightening the adjustment knobs with the other on a rough track. I even stopped and tightened them as hard as I could with a gloved hand, but very quickly after moving off again they came lose. I even lost one, thats how quick they can rattle lose. I would, and I did swap the adjustment knobs for nylon lock nuts and spring washers. Ive had no problems since with them coming loose, and have been on some worse and nasty tracks that vibrated the bike heaps. I never tried the pliers idea, but Iam a lot more confident with the Lock nuts. I set the screen to where I wanted it an have no reason to move it, but it is easily moved with a spanner (no different I suppose than getting some pliers for it) I would buy one again, and just with the small mod IE: Lock nuts,and not use their plastic adjuster knobs. All that said though I haven't had any experience with other products on the market, so cant say if its better or not, but I do like it. And with the Touratech GPS lockable mount its tidy and the GPS seems fine.
