We just got our visas renewed about two weeks ago. Overall it was about a three week process. While we are grateful that everything went smoothly and the process is over, I am not going to write in detail about it because Visa laws in Mexico have changed. The new laws are to go into effect as of January 1, 2012 from what I have been told. Because of this, much of what I might write on may not be applicable in the next 60 days or so.
I do want to point out that we did receive help from Yucatan Expatriate Services (YES). They offer a wide variety of immigration, legal and property management services for expats. Adriana and Betty are bilingual and do answer emails promptly which I appreciated. I even caught Betty about to leave for the day when we dropped in at the office. She offered to stay and help us out with an issue even though we offered to come back later. This was very curteous and helpful on her part and very much appreciated by my wife and I.
They helped me to get my required cover letters typed and filled out properly for my renewals. I had already done my forms on line which they do offer to do for you. Their visa renewal assistance fee is only $250 MXP per person if you retain them to handle all issues for you. That comes out to less than $20 per person. Good deal if you ask me.
If you need anything they are a good resource in not only my opinion but other expats as well.