The Zumo, being heavier, bounces a little bit on occasion (depending on speed, road, and the angle of the RAM arm,) but it's not been a problem. When it does move (infrequently) it's not enough to compromise viewing the screen, and the frequency is so low that I don't worry about vibrations hurting the electronics. (The Zumo is made for motorcycle use, after all.) The Escort doesn't seem to move hardly at all. Using the RAM arms places the GPS and radar detector higher up; which allows me to keep my eyes closer to the road (but they're not "in the way".) It also places the radar detector more in my peripheral vision, so I'm more likely to see the visual alerts (eventually, I may attach one of the Mark Pharnes LED units, but I haven't gotten around to it yet.) I'm not running the Escort through the Zumo, but I've considered it. At full volume, the audio alert is discernible behind the V-Stream windshield, but not very loud. I have the two-piece MCL risers. I had to trim some of the left edge off of the shelf - you can just barely see it in the photo - it's the shiny line that you see (I'm going to get around to painting it black one of these days...) I used a cut-off wheel in a hand grinder, because I already had the shelf mounted. I clamped a short piece of bar stock to the shelf to use as a guide and insure a straight cut. A hacksaw would probably work if the shelf was off the bike. I only lost a very small sliver of shelf space. The one-piece risers may require more, or less, material to be removed.
