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I ordered a Lambdaboy last Friday and I got it Yesterday. It's a good looking unit, well made and with well made cables. Last night I put the sensor down the muffler on my Honda VFR (fuel injected) held the RPM's at about 3 grand and the Lambdaboy showed 14.7 on the meter. I have not hooked it up to my Vette nor have I used the PC software that displays the a/f ratio on screen.
Overall I think the price is fair, everything you need is in the box and ready to go. I also have 4 of the boards for the DIY wide band and parts to build one so I'm gonna give one of them a try also this summer.