ThaiVisaService is the one I used many times...

Also DMK to Mai Sot is easy, often very cheap flights if you pick the right day, come out of tiny airport get a Tuk Tuk 50 baht to bridge, walk across, the Burma side will stamp you in and out, cost 500 baht + a 2 small stamps in Passport. another 50 baht Tuk tuk and your back at the airport..

Have you lots of space in your Passport ? [Cambodia you also need a full page for the Visa sticker as well as another page for the in & out stamps]

Past 4 years back on Retirement Extensions, so not used/needed to do a Visa runs [prices may well have gone up]...

yeah , the space in the passport is always an issue. They often start using a new page when there is still room on previous page also. gets my goat

... Going with an agent also minimises the likelihood of having difficulties or being delayed with questions on re-entry.

Is this true? When entering Thailand, you are one-on-one with an IO and his/her computer terminal. In Poipet, there may be hundreds of people in line. How would the IO know you were with Tour Group?

I have noticed IOs seem to be talking via headset to with someone during the process - perhaps a supervisor. Do some tour-agencies have 'connections' with the IO's and/or supervisor(s), and provide a list of their customers with a 'request' to show leniency?

I would say that being with a 'visa run" company makes no difference, you are one on one with the I/O and his computer and if he gets a alert he gets a alert

ThaiVisaService clearly state on their site that you could be refused entry if the alert sounds, whether they could then assist you in talking to the I/O i'm not sure

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I have not used ThaiVisaService in two years but they used to have someone check when you arrived to take the van....and you were not required to pay unless that person verified your visa status before the trip.

On one occasion the van was stopped by the police just before we reached the Cambodian border and there was a immigration officer with the Thai police.

We are had our visas checked and we were then passed on to continue our border run.

It seemed the immigration officer and the van owners were on a friendly "handshake" basis.

And this is why you should never be on an overstay, regardless of the length of it, and think you can take care of it later, or pay at the border.

You can be stopped and checked any time, even on your way to the border.