I think they are pretty nifty, but I'm a bit biased. Here is my Brain Board web page.

http://www.willegal.net/appleii/brainboard.htm

I used to sell kits for $59.

regards,
Mike Willegal

If you ever decide to churn them out again I'd love to get one. I have a spare II+ board I've thought might be fun to slap in a wooden case and pretend it's an Integer Basic-equipped II board received in trade for an Apple I board...