Hi,
I know I'm biased, but I've been carrying the Para & Manix with SPY27 quite a bit. I certainly have a vested interest, but I've been pleased. It gets very sharp, at least with ceramic. Edge retention is good and restoring the very sharp edge is very easy. I've just been using only the corner of the fine stone at 30 degrees. It certainly is a gamble, and an expensive one, but I'm glad we did it.
I don't know how many have done this for a production knife. Dan Maragni developed a higher performance steel for Lynn Thompson that they called Carbon 5. Dan monitored and directed the melt. I didn't see the melt, but I worked with "Bobski" for along time refining and prototyping.
For you "Blade Steel" guys, I think you should try it, even as a Mule Team if nothing else. Carrying the steel EDC is working out OK for me.
sal