1) very complicated to use & the screen is hard to read because it is so crowded with information. Too many buttons, hard to memorize the exact sequence of button-pushing to get the information you want, & tricky to do when you are out riding. Also, averages are not accessible while you are riding (speed, HR) -- you have to finish your recording session & scroll through memory to access these #'s. More than one LBS admits that lots of these have been returned, or replaced by something more basic for on-the-road use by their customers. It is a good tool to use on the trainer, if you are a real techy.
2) Ciclosport seems to have had lots of problems with this model, they set up a special web-site just for trouble-shooting this one. I did not get the HAC4, but the one I did get was very finicky with weather. Temps below the 50's & I had a 50/50 shot it would work, and bad road conditions would cause it to go on the fritz as well. Nice screen, but not reliable enough for me.
I ended up with a Polar running computer for HR functions, & the Mavic wireless for bike computer (replaced my Specialized, which had a great screen, but the wires kept popping out of the housing & were thin & easily bent). Now, everything works. If you feel you need all-in-one, I would probably look at the new Polar CS-100 or 200.



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