Bests & Worsts Reviews from Amazon

This unit works very well until it flakes out and fails. I've had two of them. The first started to lose contact with my Garmin 510 after about a year. Replacing the battery helped only marginally so I bought a new one. After only three months it is starting to fail, which leads me to my second complaint. Of course the first thing you do when the unit starts to fail is replace the battery! But this is tremendously tedious and error-prone. Rather than use something reasonable like a tiny hex-head screw, the unit has miniature philips-head screws, so tiny that even a #0 driver doesn't fit. I end up using jewelers tools, but the screws are in so tight, the only way to get them out is to clamp a vise-grip on the tiny screwdriver and wrestle it into submission. Here's hoping that the battery is the problem this time.