I have only parted with 11 timepieces since I got into this wonderful hobby back in 2005 and (thankfully!) have not really regretted my decision in any of them. What I regret was my chance to get a 116610 and 116400 many years ago. I also remember when my AD had a GMT at a steal (back then of course!) but turned them down. Such is regret. Regret because I would never have let them go.