Amen Lewis, you and I are a lot alike. I've owned over a dozen 7750 based chrono's and a couple of Zenith based and not ONE problem........EVER. In fact, I keep the chrono running 24/7/365 most of the time with all of them and, once again, never one problem. IMOP, in regards to quality chronograph movements, if you don't run them periodically you WILL have problems. Now, as for rep chrono movements, I'd say the 10 second rule is a very good one.