I have had 1/2 a dozen + barrels done by Hobie and Kathy Bond. I know nothing about the process, but they are great people to deal with and produce a quality produce at a quality price. Every bbl. that I have that has treated cleans smoother, maybe in some part to how I break-in my bbls. But anyone that knows me also knows I don't baby my bbls. To me they are like tires on a race car. Ya gotta heat them up to really get the best out of them. When there done, there done. Replace and repeat. I honestly believe that the cryo treatment extends the useable life of a match grade bbl. I think this is even more so if you shoot and overbore/hotrod cartridge, which I do. I might also mention that I shoot sling/irons, not BR so it's not 5-7 shots, it's 22+. I normally run a string of 22-25 rounds in about 12 min. weather and pit service permitting and 3,100 fps. isn't just chugging along either. Run the numbers. With a pointed 140 JLK, I'm between 20.5 and 21.5 moa at 1K. I believe that cryo'ing my bbls. allows me to do that.
I hope this helps,
Lloyd