my old car had it on the headlamp. Was sticked by the TnG people during beta test. It worked like a charm and never once failed.

When I changed my car, i bought one unit and sticked it on my headlamp..same place. Kept failing all the time. Then asked for a replacement and sticked on the windscreen. Seems perfect now. Drove from KL to Penang last few days. No issues whatsoever.