I know that people who use an agency for the visa sometimes get slated and told it's a waste of money and so easy to do yourself, but if you are someone who is looking for that, I used A&S Visa Services AllSabaai Thai and they were first class. I flew into Hanoi on Saturday and my visa was approved yesterday! I honestly expected to be here at least a week (booked two weeks) so to have the visa already is awesome. Sent the agency my arrival stamp when I landed at 1am on the 6th and got my approval email at 6pm last night (Dec 8th). Any questions, fire away. Will be happy to answer.