These Echos are great saws. I just picked up a couple new CS600P's. one with a 20 inch bar, & one with a 24 inch bar. I also have a 330T, CS370, and a CS400. They aren't built like my 372XP, but they aren't $900, either. For the money, you can't beat Echo. The 5 year warranty is nice too, but you probably won't need it.
BTW, the "P" means it has the upgraded bar & chain. Basically a rebranded Oregon powermatch.
I didn't cut a popup for it, just tightened the squish. I never checked the compression though....before or after. I doubt it has any more, and may even have a bit less after raising the exhaust port.
I watched the vids several times just trying to time the cuts - looks like stock the cuts were about 15 seconds, and after Mastermind did his magic they dropped to like 7 or 8 seconds!
It sure sounded like it needed a tuning awfully bad in the stock vid so no wonder it cut so slowly. Great work on the mod though. Kind of what the echo saw guys have been saying all along.