The fact they are no longer in production after a short production run must tell its own story. A well known ex world champ used one for a year, seemingly having no end of trouble with the thing.
AirArms RN10/EV2 Stock-2007 Big nikko FT Kit
AirArms NJR100 Hawke Airmax SR6 HFT/SFT Kit
Feinwerkbau 600 10 metre
HW77K-zeiler 6-24x44 Work in progress
Webley Vulcan .22 Lovely old relic