I've got nothing but praise for the service. Arrived at 8.45am and I'd had all my papers checked and the stamp was in my passport by 9.15am. There was then a short wait outside for the Immigration Chief to initial the extension and I was away just after 10am.
Two copies of the details page of passport, original Non Imm O visa, entry stamp and departure card were necessary first. Application form, one passport photo. Embassy letter confirming my monthly income. Rental contract of our residence here, together with a hand-drawn map of the location. 1,900 Baht.
That was it. I had other information, but wasn't asked for any.
After 10 years living in HH, I'm now the proud possessor of an annual extension. No more visa runs. A relief.
HHAD dosn't get rid of me so easily

BTW: for Brits, Imm were converting GBP at 61 Baht.