Freezer,
"A tooth rattling, bone crushing magnum that will make you cringe and flinch every time you pull the trigger."?
Magnums are magnums whether they are powder burners or spring-piston guns.
High-power springers like these usually require a different hold than any other gun as they have a foreword and back recoil due to the spring going off. They are also harder on scopes than magnum centerfires because of the reverse recoil. And since airguns have a longer lock time than a firearm you have to have good follow through or you will not get good accuracy. I had a Gamo Shadow 1000 (similar to the Big Cat). Lousy trigger and lots of vibration and hard to shoot straight. I had to really focus to use it and still not much good with it. I gave it to my Dad and he seems to have had better luck figuring it out. He can get quarter-sized groups at 25 yards using Gamo Rocket pellets. Pumping can be a pain, but I can shoot my old Crosman pumper a lot better than I could that Gamo. My son also has a Shadow 1000. We compete at 30 yds to see who can hit a 4" steel plate. He refuses to use a scope, preferring open sights but he always seems to have trouble keeping his sights sighted in. For me, 8 pumps on my old 66 Powermaster with Simons 4 power can ding it nearly every time.
The Gamo has an adjustable trigger, but usually you can't tell much difference.
The Quest is a Chinese made copy of the Gamo, right down to the crappy trigger. There are aftermarket upgrades for the trigger that work in both the Gamo and the Crosman. Also Crosman seems to have better customer service than Gamo.
Hope this is of some help to you.