Our club owns one of these and I own one personally as well. We loan the club rifle to shooters who show up wanting to try indoor air rifle with our group. My personal rifle has been on long-term loan between two different club members for several years. I'm not sure I have shot it two dozen times since I bought it. They are decent rifles and compare well to the other NRA/CMP Sporter rifles.
In case you are not aware, there is a trigger modification with instructions that you can find online. My rifle needed it and it now has a crisp 1 1/2 pound pull. Another common modification is to add an additional barrel weight immediately behind the one that is currently attached to your rifle. This brings the weight up close to the 7 1/2 pound limit for Sporter rifle and improves the balance. I would recommend keeping a supply of cylinder O-rings and a burst disc/relief valve on hand as I have had to replace these several times. All of those parts are available from Daisy Outdoor Products. Be sure to lube(but not overlube) the cylinder O-ring per Daisy's instructions. Lastly, be gentle with the fill hose thumb screw if you are using the one from Daisy. We have three at our club because the thumb screw keeps coming off the valve. I have repaired each one with Loctite, but if the problem continues I may have to drill thru the knob and shaft and install a pin. We weigh our cylinders as we fill them. They are easy to overfill-hence the relief valve.
The rifle feels nice and shoots quite well. With two stock spacers, most adults will find it comfortable. One of our club members has cleaned the AR 5/10 target at 10 meters with my rifle from prone with sling using Champion's Choice pellets and it has also turned in some very good 4-position scores at 50 feet over the years. I think the advice above regarding cleaning the barrel is good.
Good luck,
BB