I just returned from my thai consulate in the United States to pick up my OA long stay ME visa. They were incredibly efficient and helpful. If you go in prepared with all the documentation that is listed in your home country website, you most likely will not have an issue.

Dont forget to leave a couple of days  before your permision to stay expires, to get the second year on re entry, and of coures the re entry permit for that second year.

Out of curiosity which consulate was this - and was your application subject to any notarisation requirements akin to those which the London Embassy requires of us Brits? I was fascinated to learn just now in another thread that the New York Consulate do not insist on any notarisation requirements! Is this generally a USA thing? 

Nyc. No notary required.

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Dont forget to leave a couple of days  before your permision to stay expires, to get the second year on re entry,

Leave a few days before your O-A visa expires, not your one-year permission of stay stamp, which will expire after your visa by a factor equal to the number of days between visa receipt and entry into Thailand.