A bit late on this but I've been away from the forum for a while...but I've got a Nashbar wireless and I've noticed some wacky max speed readings as well. Everything else seems to work just fine, but I'd get to the end of a 3 hour ride and my max speed was between 60 and 74 mph - HA!! I'm trying to find a good computer with cadence - was thinking I wanted wireless but after reading about all the problems, wired is fine as long as it works.

I also noticed the Nashbar would go nuts if I got it near my wireless laptop, ruining my data until I figured out that I need to step AWAY from the laptop when I'm inputting the data. I think this is just a problem inherent in less expensive wireless computers (I got mine in a package deal with a Polar HRM watch - LOVE the HRM, not so much the computer).

I just got a Blackburn Delphi 2.0 for my *NEW* Specialized Rockhopper; I thought it had wired cadence (misread the package and didn't research it - my fault), but it doesn't so I'm returning it after reading bad reviews and discovering the lack of a cadence feature (and, apparently, no way to upgrade and add the cadence sensor). I've read that the Sigma BC1606L is pretty good, so I think I'll order it and see what happens. I'm not a racer by any means, but I am doing the 65 mile LIVESTRONG ride in October and would like to be able to train well so I can finish it without dying.

Just my $.02.