Things I liked: Value, accuracy.
Things I would have changed: Recoil and definitely change the trigger pull. You MUST use a single piece scope mount or suffer endless adjustments due to strong recoil effects.
What others should know: I've tried various scopes. Currently using a Leapers. You will want to use a single piece scope mount with a stop, unless you like to adjust your scope every time you shoot. The recoil will play havoc with your mount, otherwise. I've done comprehensive testing of many different types of ammo. The best for this gun is RWS superpoint for accuracy. After cleaning the barrel, it takes about 30 rounds or more to settle in but with a decent scope, I'm getting groups of less than one inch at 30 yards from a sandbag rest. The trigger pull is atrocious. It's WAY WAY too hard. No way can you fix it by simply adjusting the pull. Be careful if you buy a trigger kit. There are well known aftermarket triggers but they will not fit my gun because of the low-end trigger assembly. I have seen references that they DO fit the older guns, though. For each of these drawbacks, I have to say it's a heck of an air rifle for the money. Hard to beat the value. I care about accuracy first, velocity second (it will put wad cutter pellets through 1/2 in plywood all day long)and trigger pull and recoil last. I don't want to minimize the trigger and recoil because when I miss, I know immediately as I'm pressing off my shot that the gun has recoiled off target or the trigger pull has swayed me off. With an air piston and a good trigger, this gun would be a true star. As it is, with a single piece scope mount, it's a darn good value and very accurate WITH THE RIGHT AMMO.
Things I liked: Barrel quality is excellent. So is the Quattro trigger. The trigger adjustments give a good range of adjustability in both stages. Hard to find these features in a air rifle in this price range. Hits very hard! Heavier pellets worked best for me. Accuracy at75 yds is amazing when i follow a few steps I've developed for loading and sighting. .
Things I would have changed: The second stage pull is still just a hair strong for my personal taste. I wish they would either drop the scope or just put a nice one on the rifle. This is a complaint against most of the package air rifles out there that I've bought. The included sights are excellent, though.
What others should know: I've tested several types of pellets using a combo of a barrel mounted green laser and a Leapers scope. Some pellets are a tighter fit than others and may sit just proud of the receiver when you close the breech. The pellets can get pinched and you will have no accuracy. Use a pellet pen or similar device to seat pellets at EXACTLY the same depth into the barrel and you will be nicely rewarded with consistent range. The break barrel does not "click" into the exact same position each time it's cocked. I learned that I need to push it upward and settle the barrel into position to get the barrel mounted laser and scope to line up. Otherwise accuracy sucks, even with the excellent barrel. If you do this the same each time you can get very nice groups at 75 yards! The nitro piston is outstanding after 1000 rounds. The precision of the break barrel pivot is good but it's still the #1 weakness in this otherwise incredible rifle. As it is, it is still excellent and maybe a couple of gun smith tweaks away from being the only air rifle I'll ever want to shoot again. My best results so far have been with RWS domed 14.5g, seated with the skirts at 1.5mm depth inside the barrel, using artillery hold. At night, the pellets always hit the laser (again, which is BARREL mounted) at 30 yds. At 75 yards the air temperature and air movement need more compensation. The rifle blasts through 1/2 inch plywood with ease. Hard to cock unless you put the butt against the ground.