Pass Labs upgrade?


Hi,
i am looking to hear from anyone that has/had the Pass Labs XA-60.8 amplifiers and upgraded to the Xa-100.8 amps. What was your experience like ? Was it worth the leap?
my speakers are pretty efficient @ 91 db but I am interested in the next model of Pass Labs for potential increase in overall dynamics.
jb2455
I see that Don. I was thinking that with so many responders here having spoken to Nelson and Kent, since we are in  their 8-10 year timeframe, maybe they had some inside info...
I have and love the XP-20, but have found every new generation of Pass to be a significant upgrade
XP-20 is the finest preamp I've ever owned. Prior to the XP-20 the best pre I ever owned was a CJ Premier 17LS2