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The one that costs more is the first version of that PCB I believe, and the $39.51 one is the newest revision of it. I think the only major difference is the location of the USB and RJ11 ports. Functionally, they should both be the same.
I just received my MPGuino kit (version 2), and got it put together the day it came. The instructions on the website are very easy to understand, and the small size is very convenient. It comes with everything you need, except for a phone wire to connect the MPGuino to the phone jack that comes with it. You'll also need wire to connect to your car's power, ground, VSS, and injector signals, but other than that, no other parts are needed.
I just used the MPGuino on a 150 mile trip today, and it worked great, nothing seemed out of the ordinary, speeds remained constant, and mileage readings seemed pretty accurate.
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