Walt:
I have a MM TF58 that I've had for about a month. It probably has 500 to 600 rounds through it now & I really like it. I might be the odd guy out here but for me, it works really well.
Some history: I shoot mostly indoor 10 meter paper punching. I have about 25yds. outside but I have not used this rifle out there. The rifle was lube tuned & had a little trigger work done by Mike M before it was shipped to me. The rifle shoots with no spring noise, just a thunk. The recoil is gentle & is linear. I'm lazy so I shoot off of an old camera tripod, the rifle is unsupported other than the tripod. Now that I have 'shot it in' the groups are getting smaller & smaller. All in all, a nice, medium power springer.
If Mike M comes on board he can give you much better information on the insides of this rifle.
Hope this helps, Mike G.
PS: I just read through this post & I can't believe the stuff I'm saying about a Chinese airgun!