Today I replaced a Dampa mount with the above scope mount in unison with a Simmons Pro Air 4-12x40AO on my Diana Airking !
This afternoon I spent time "getting used to it" on my local indoor range, bench rested out to a distance of 33 yards.
So far the results are very encouraging using JSB Express 4.52's
5 shot groups have tightened up from 10mm approx, to 5mm "one hole ragged" groups and with a little more lead put through the gun these may improve even further !

Must say, as with most German products, its exremely well made and well packaged as befitting of Diana products, OK not cheap (about the same as a Dampa mount) but in general you get what what you pay for.

Its natural to have doubts about any new piece of kit but this "sliding" anti recoil mount appears to do "what it says on the tin", so I'm quite impressed and I would imagine it would perform well on a TX200SR or any Sliding Sledge type air rifle !