So I got the JAW + Display kit a couple days ago and built it last night in about an hour. This is how it comes:
Everything came in 1 antistatic bag, so I hope you're good at reading resistors, or at least have a multimeter available.
This is everything out of the bag:
Not too many components, nothing complicated, nothing real small to solder.
An hour later here is all of it built:
Note that I didn't mount the display to the board because I want to put it in a little project box from radioshack and mount it on top of the steering column cover.
Here are closeups of the controller board and the display board:
I used a 12V 1.7A AC adapter that I use for my MegaSquirt Stim to power the board, plugged the serial cable in, and fired up the software. The software is really easy to use and very basic, just select the COM port and go. The firmware was uploaded in less than a minute and voila, it all works.
Overall it was very easy to build. If you can build a Megasquirt this will be duck soup; however, there's no real way to test it until you're done. At only 80$ not including the sensor, this is a great deal. Now I just have to wait for my wideband o2 sensor to come in and figure out how to configure the JAW output for the MS.