It's been a month or so now, since I installed the SportVue http://www.sportvue.com/ system to my BMW. I thought I'd give myself several rides over various types of riding environments, such as city, highway, twisties, etc. to get used to the unit and get a true sense of what I thought of it.
So far, I'm pretty disappointed.
Firstly, it's not as easy to read than how it's advertised. The telemetry readout is very small and sits above your normal field of vision. To read the telemetry, you must glance up from the horizon to read it. True, the shift of focus is not as drastic as glancing down to your speedo and tach, but it's the difference between a 1/4 of a second of reflexive vision, especially if you've got an easy to read digital speedometer.
As for the tachometer telemetry, it's very vague. It's not much more than a line of bars that go up and down, depending on your rev range. It will flash if it thinks you're close to redline, but a string of bars is not a true tachometer reading, not without numbers and a visible red line.
The gear selection indicator competely failed for me. Most of the time it told me I was either in 6th or neutral but that's it. Since it was never reliable, I disregarded it.
The radar detection warning system when it did work, was totally lame. The telemetry reading would flash 'radar' on when I got an extremely strong radar signal from my detector but fainter signals would fail to show up. Plus the flashing display was hardly enough to catch my attention, unless I happened to glance at it at the time. I refuse to rely on this feature to help warn me of impending radar signals.
All in all, it struck me as gimmicky and unpractical. I'll be yanking it from my bike during it's next service.