I'm going to make a quick post here, and will be back this weekend for a longer review.
I bought one of these units about 6 weeks ago. In short, it works perfectly and accurately. It takes a little tweaking to get used to it, but I have found it to be within about 100lbs of the exact weights I am getting when stopping at the CAT scales I use.
More importantly, I had a few questions and sent an e-mail to their engineer. He returned my e-mail a few hours later, and I have been in almost daily contact with him for the last few weeks, working out issues I had with my truck, that were not related to the haulgauge unit.
A real review will follow, so stay tuned.....
Jerry