There is definitely a perceptible difference in the R-value - Enough that I dislike using the x-therm in the summer and strongly prefer the x-therm in later seasons, specifically when there is any chance that overnight lows dip below 30F.
I picked one up used at a relative "deal" and I've been pleased.
It's fast and it feels like a fast bow, with a sharp transition from peak to valley.
peep rotation has been an issue
The trade-off of light-weight is susceptibility to being blown off target, balance and extra weight are...
For Sale, I have a Carbon Fiber pre-fit Barrel for Bighorn / Zermatt Arms TL3 / SR3 Short Action(s)
Product Number: 113042 TL3/SR3 Short 20 8 5/8-24 Sendero 2lbs-11oz
$825 Shipped TYD
Paypal preferred.
Really similar setup to yours just built off of a Zermatt Origin action and in 6.5.
I opted for a spartan gunsmith adapter (also run a classic pic adapter + a javelin during hunting season)
Works great, but some fore & aft adjustment would be nice in some positions.
For Sale, I have a brand new in box Carbon Fiber pre-fit Barrel for Bighorn / Zermatt Arms TL3 / SR3 Short Action(s)
Product Number: 113080 TL3/SR3 Short 22 7.5 5/8-24 Sendero 2lbs-12oz
$725
Paypal preferred.