You can trust your Cressi SL cause it's a very good gun. I'ts comparable to the Mares Sten, Seacsub Asso, Tigullio Ras, Effesub Magnum and all the other airguns sharing the same fundamental feature: the inner barrell is 13mm (unlike the 11mm of Cyrano, Stealth and Spark) allowing to shoot thicker shafts (8 to 9mm), providing a remarkable shock power.
The unique feature of the Cressi SL is the position of the inner barrell: it's not concentrical to the outer barrell, but located on a higher axis, closer to the upper edge of the external barrell, making the aiming more instinctive, almost as instinctive as on bandguns.
This doesn't mean that the Cressi is more accurate, but as a matter of fact it's a bit easier to aim compared to the others: this fact practically ends up with more accuracy.
Another thing I like of it is the handle, more ergonomic than the other airguns. It's the classic Cressi handle, used also on the Cressi Apache and Comanche bandguns: a much better grip than, say for example, the Mares Sten.
You can upgrade your gun with a Mamba kit and it'll become a true hell of a gun.
ps. The "SL" acronym means "Super leggero (super lightweight).