Sorry to be short but if I can help...
Been travelling for the past 18 months straight on my R1200GS. Using Quest 1 in the Quest plastic cradle then onto a Ram ball mount. It has always held fine and solid, and vibration is not a problem on my bike, nor on an 1150GS that another rider has whom I met along the road and swapped bikes for a few hundred miles. The Quest cradle comes with a hard wiring cable that you can either attach to a activated power source or as I did, connect a male auxiliary socket and plug it into your power outlet. The locking mechanism is a plastic slide that pushes two small pins into holes on the back of your Quest. As I said it works great AS LONG AS YOU MAKE SURE IT IS SLID BACK ALL THE WAY IN (about a quarter inch travel). Really, it has never been an issue until, literally today, when in a rush I didn't push it in all the way and about 2 miles onto the highway it popped out of the cradle so that I could watch in my mirror as it bounced along the road before being crushed by the truck behind me. That being said, if you lock the switch it is virtually impossible to remove from the cradle. It was totally my error. If I had the Touratech cradle, which I did buy at first and then returned, it would not have popped out IF I USED TKE KEY LOCK OPTION, but still it comes down to user responsibility. Is the 3x cost of the Touratech worth more than the plastic Garmin? If you appreciate fine craftsmanship and have the money, the Touratech is a lovely piece of machinery. I returned it because it didn't come with any power cable and it just seemed too much to pay for what it is meant to do. Also, I think the plastic Garmin cradle looks like part of the bike and not something to steal, unlike the Touratech which is so nice looking it would certainly attract light fingers in many European places I've been to.
The Garmin cradle also takes up less visible space, giving me more view of the instrument panel. May I also highly suggest getting a com-unit like the Autocom (best service I've had from any company) and taking advantage of the voice feature of the Quest. It is so helpful and releases me from looking for signage or focussing too much on the Quest screen, to enjoy the ride and the views with confidence of taking the right turns.
\"...live Life to its fullest, appreciating every moment big or small, but always with Honesty and Sincerity.\"