I've used them on three different cars over the last 15 years and purchase of a Fumoto valve is usually one of the first things I buy after purchasing a new car....these days, right after the spare tire to replace the inflation kit.
If you don't change your own oil, I think there's legitimate fear in a quickie lube tech approaching it "the wrong way" or otherwise reinstalling or manipulating it wrong. Similarly, if there's nothing protecting your oil pan and the valve is dangling down, then I might be hesitant to install one. My current vehicle has an open cowl around and below the pan that serves to protect it from road hazards. On that count, if something got up there it would probably take the pan with it anyway so I don't have any issues with using the Fumoto.
If you don't change your own oil, I think there's legitimate fear in a quickie lube tech approaching it "the wrong way" or otherwise reinstalling or manipulating it wrong. Similarly, if there's nothing protecting your oil pan and the valve is dangling down, then I might be hesitant to install one. My current vehicle has an open cowl around and below the pan that serves to protect it from road hazards. On that count, if something got up there it would probably take the pan with it anyway so I don't have any issues with using the Fumoto.