Bob:  I have a few hours on my Chelton Flight Logic with a Crossbow 500 and am very satisfied.  Please understand that I am still reading and experimenting and figuring and hope to fly a coupled approach one day soon, but the attitude display and PFD have been great.  I had some installation challenges, and calibration challenges and had a chance to work with the Chelton and Crossbow techie folk and they both did a fine job.  Sure I miss D2A because they were very responsive, and of course they don't have any of my money, but what I am trying to say is I think Chelton is still worth the effort, and the 500 though expensive is a good, stable AHARS. 

Glad to hear your engine is shipping--mine continues to run fine.  I have some high CHTs on cylinders 1 & 2 (higher than the rest, not too high to fly) and so will have some fly, fix, fly ahead of me.  But in general the plane is a joy and the avionics will be awesome if I ever learn how to operate it/them.  So the msg is:  After 5.5 years on my project I am happy with the result and I am sure you will be too.  hang in, paul