Things I liked: Well, I have to say that the stock is MUCH finer than the illustration might suggest. Pretty piece of birch, I think, with a lot of figure in it. I kinda disagree with other writers who have complained about the included Ruger (TM)-branded scope. IMHO the scope is quite adequate for the plinking I've been doing and capable of giving me 1" groups at 50' out of the box. I expect that to improve as the gun breaks in, beds and settles down. The machining that I can see without removing the stock appears good, the trigger first stage is long, second stage short and heavy but not unduly so. I really like the solid rubber butt pad, which gives a good firm grip on floor or foot for cocking, and which snugs well to shoulder for the shot.
Things I would have changed: For the money, there really isn't much to be changed. Better scope mounts (I've ordered Leapers) would be nice, as would checkering on the fore-stock and grip area but again, those'd just add to the price. As I've said, I think that the scope is adequate. Time will tell whether it will hold up, and I think the replacement mounts will help. Out-of-the box the barrel seal or o-ring sits below the face of the breech and I've ordered replacement seals and shims to take care of that. Again, I think that sufficient quality control to screen out this problem would have added to the price.
What others should know: You will want to check your breech-receiver seal for depth. Mine sat low out of the box. The scope mounts really are (as so many have noted) rather crude. It's possible that they are adequate but I just don't like their looks and am going with the Leapers mounts. This is a fairly heavy gun - helpful with the massive air rifle recoil and rebound - not something comfortable for hauling around in the woods of a morning. Wish there were fittings for a sling. Have to look into that.
Things I liked: Feels solid. Clear optics edge-to-edge. Repeatable windage and elevation adjustments. Mounted to my inexpensive Ruger Air Hawk and shot close to point of aim prior to adjusting. Nice. Scope caps are ok. Of course you'll need to remove and replace scope caps as they rotate with the adjustable objective and with the ocular adjustment. Short, light weight.
Things I would have changed: The only things I would change would mean buying a different scope. I suppose adjustable power is nice, but don't need it. I imagine that an illuminated reticle is fun but would never use it. Schmancy target turrets for windage and elevation together with a side wheel for objective adjustment would make me feel real professional. I'm not. It's a simple, light weight, relatively compact scope with clear optics and repeatable adjustments that holds its zero solidly, and in a useful power for target and plinking. What more could I ask? Maybe a different reticle. A simple cross hair would be an improvement for me. I find the mil dot reticle/system annoying and next to useless. As in, "Hey, squirrel, let me pull out my range calculator so I can dial you in." As if the squirrel will wait.
What others should know: Don't know who or what "Leapers" (TM) is, don't care. The scope is marked "UGT" (TM).