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
We know that Pass Labs is the best SS currently. Any of you guys using these power amps on Thiel speakers?
Agree with reaching out to people including Nelson at Pass Labs. i was looking at the First Watt line but after several emails with Nelson, stepped into a xa30.8 with the xp10 preamp. He was very patient with my questions and helped me make an informed decision. 
any word on replacements for the XP-10 and XP-20, as they've been around 7-8 years now? 
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...