I've had it around 6-8 months , I guess . Like yours , mine was 'new to me' . I don't think I want to walk around all day with it , thought it's probably not as bad as my full frame Canon and 100-400 . My sample's zoom ring gets a bit stiff towards 300 and up , though it seems to have loosened up a bit ; or maybe I'm just getting used to it . Not gritty or anything , you just have the feel that lots of stuff is getting moved around inside the lens . It was picked up originally for a trip to Yellowstone/Grand Tetons I'd planned for the fall , but the virus had other ideas . So the trip's gotta wait , and I get time to practice with it as the lens is definitely 'specialist optics'