I have two VDO's: An MC 1.0 and an MC 1.0+. The MC 1.0+ is an analog wireless and the MC 1.0 is wired. I have found that the wireless one is vulnerable to rf pickup which can greatly distort the readings. I have been out in the country stopped by a store and had it register 50 mph. Also, I have had a pace line of about twenty riders pass me and suddenly have about 10 miles added to the odometer. I now use the wireless one on my mountain bike and ensure it has fresh batteries.

Just a consideration if you are really counting on this for accuracy.