If you're going to be a serious chrono guy, buy an expensive one. But if you're going to be a chrono hobbyist like most of us, one of the $100 ones will serve you well. I've sprung for two "better" ones and came back to a ProChrono Digital with their Bluetooth adapter. I compared readings with a Pact (when it actually worked) and a CED M2 and the difference was in single digits so I see no need to buy anything else.

Ed