I've had a fair few come and go over the past 9 years, but the only one I had vetted was Cherry, the first. And that was because I bought her when she was in recovery from a tendon injury so even that was only a two-stage. I don't agree with the flexion test because it can be inconsistent and yes, obviously it can bring to light things like sight problems and heart murmurs but I've been lucky and nothing untoward has ever presented itself afterwards, thankfully. But I've never paid out lots of money as a purchase price for any of mine either so I kind of "paid me monies and took me choice"....