I bought a 12 function on ebay for less than 40 dollars in march, so far so good. I like how its easy to unhook the sensor and computer when the bike is locked.

The scrolling speedo is not too bad I actually like it.

My only complaint is that the device must be mounted to my stem to pickup (no top tube option for me). In the day time its not bad, but at night when I want to see I have to adjust a little. With a different stem angle and seat height this can be corrected. I do not have any other computers to compare to but I like this one.