@Marty ********
yes, you have the option to convert from the 1-year stay permit out of a O/A visa to the 1-yer Extension of Temporary Stay Permit, instead of doing a border run to get stamped into a second year. Is what I was saying! The downside of going into a "1-year extension" (EOS) is, that from now on you need the 800,000 THB in a Thai bank account, and Immigration does not accept a foreign health insurance any more (except if they acknowledge that you are under the "grandfathering clause"). And correct, I would not recommend the O/A for anyone who wishes to stay longterm in Thailand, as if you start with the Non-Imm-O visa, you keep your freedom of choice regarding the health insurance