FRD Tools

[Uncle Paul]

I ran across these on another forum. Anybody used these? Good, bad, ugly?
http://www.pvconsultants.com/audio/frdgroup.htm

[JuniorJBL]

I once started to build the speaker workshop jigs as they describe and was going to use frd but I never got that far.
If you are interested I still have all the parts. You would need a mic pre as well.
Shane