I bought one years ago & was never happy with it. I had to send it back within a few weeks because it lost power. Once I got it back, it was back to full power . It had the stock with it, but it was flimsy & wobbled up & down , making it inaccurate to shoot with the stock attached. Shooting it as a pistol was OK, but I gave it away.
I have a .177 in pistol form with the recoil reduction rail. Topped it with a reflex sight. I'm not a good pistol or springer shooter, but this one shoots ok for being a break barrel. It can do under 3/4" groups at 10m rested. Many think the .22 is underpowered, as the longer range shots need holdover. I call it middle of the road as far as a compact pester. If better accuracy is wanted look into CO2 power like the Diana Chaser, there are custom grips etc for the Chasers at Buck Rail.177
I had one years ago in .177 with an (adjustable) gas ram. Wasn't the current QE model. Build quality was typical Hatsan, meaning it works but definitely not a show piece. I forget the weight exactly, wasn't light or too heavy... was manageable. The grip on the pistol only variant (no buttstock) favored right-handed shooters only with no aftermarket grips (that I was aware of). The action "slides" on the grip frame in attempt to greatly reduce the Mod25's recoil. It balanced fairly neutral, most of the weight being in the action. The majority of the sound came from the action but if one wanted a little quieter plinking the barrel was threaded 1/2"-20 (for the barrel extension). Front sight was elevation adjustable, rear was windage and elevation adjustable. I was never very accurate with that pistol so I found a new home for it. After a couple years of use, I was informed by the current owner of it that the gas ram went flat. It was shot quite a lot and they did very well with it. Not certain if the gas ram seals went or storage in the cold (or combination of both) caused the issue. For this reason, I would recommend a springer variant over the Vortex ram, if possible. Either way, the gun has enough gusto for light pest control at shorter distances if the shooter is accurate enough.
I should add that mine was in .177 & was not QE. Seems like this thread should be in the Turkish Gate ??