I have a Prosport in .177. It's a beautifully made gun that is exquisite in appearance. My walnut stock is good to very good in figure and wood-metal fit is excellent, but the finish is dull, thin, crying out for a refinish, I think. The stock checkering is laser cut, with curlicues and all sorts of (to me) weird designs: somebody went bezerk with the laser cutter device? The trigger is excellent, my gun is extremely accurate and well tuned from the factory. It's a very heavy gun, the cocking linkage seems weak, and it's difficult to cock multiple times unless your in really good shape. I've even considered "detuning" the gun make it easier to use?
I suspect this is a gun may have been designed for the european market, but pushed in performance to appeal to the american market? Sometimes I've thought this AG is best reserved for display with your Purdey's and Hollands, or to use when Phil and Queenie invite you up to hunt for paintballs up at Balmoral?
All this snark and criticism notwithstanding, I love the gun, have not had any problems, think of it as a Rolls Royce of airguns. I have no experience with the TX, lots of folks really like them?