I have one,
It works good, but it's hard to read when you are riding.
Easy to install, but programing the computer is a pain in the neck
just take off your right front wheel, take out a bolt, put this new one back in (provided), drill a hole(shows you where on the instructions) screw the plastic piece in, run your wire up to your handlebars, (has a clamp that mounts to handlebars) and program it, put a couple zip ties on the wire and you are good to go.

If I was you though, I would just buy an hour meter. That's about all I use mine for, and it keeps my mileage which is pretty nice also