Thanks for all of your responses. I know there is not really a comparison, given the history of 3Rensho. However, I guess what I'm asking is if the price of a 3Rensho frame really justify buying over an unknown brand, similarly hand crafted?

Granted, I don't have to see a 3Rensho in person to buy it, that's part of the power of the history.

But I spoke to Jorge from Sparton frames on the phone unfortunately the info available on these frames is too wishy-washy. Can't get a straight answer on geometry (I have see some in pics videos that look awesome, but some that look slack, plus the specs on their site looks like road geo).

I think the answer is just to get a Sparton frame. Set it up. Ride it. If it doesn't do it for me, eBay it & buy the San Rensho.