Field report: Trat immigration
Relatively painless for us as a first extension (apart from waiting around during the 1hr lunch break).
However:
Witnessed others being turned away without the Embassy letter
They are also being picky about photos of accommodation needing to include yourself together with your landlord - some people had just brought their landlords with them and this seemed to work!
Advice (sorry if it's teaching you to suck eggs):
Go prepared with all documents printed and copied;
Double check what YOUR PARTICULAR immigration office requires before heading there;
Take pen, water, snacks, a friendly attitude and plenty of patience - barging in front of people queueing or getting annoyed with hold ups is not the way to go
We're all in this together!
Good luck!