Things I liked: Ram Air Gas Spring is smooth, quiet, powerful with no spring noise or reverberation. Not cheap, but after experiencing the difference, I'm extremely happy that I went with the upgrade. CFX was consistantly accurate right out of the box. I.e. no "seasoning" of the barrel. Fixed barrel is the best! Sturdy construction, including the cocking movement. For those of you that don't want to mount a scope, like me, the Tru Glo sights are the only way to go.
Things I would have changed: The girth of the muzzle component, which encompasses the front sight and cocking lever locking mechanism, is fairly significant and may cause the elevation screw to be pushed to it's limit.
What others should know: Elevation adjustment screw is close to "maxing" out. Probably due to height of front sight. If you're on the fence about converting to the gas spring, go with the gas spring, you won't regret it.
Things I liked: Quieter, smoother, no spring noise or reverberation. No loss of power.
Things I would have changed: Nothing, except maybe reduce the price a little.
What others should know: If your hesitant to make the upgrade to the gas spring, but can afford the upgrade, make the switch...you won't be sorry.