Neville - my partner-in-crime (fellow measurer/business partner) just recently purchased one of the electronic counters in question. Since I have a JO, a side-by-side comparison might be possible.
I have a local 5K to measure and get out to Doug Loeffler (I know Doug's business sometimes gets in the way of speedy certification - we've talked on the phone a couple of times.) very soon. Would you like me to send you copies of Protege and JO measurements if I can get my partner to ride the course with me?