What are the requirements and pros and cons of a permanent resident visa in Thailand?

Unfortunately this isn't thai visa related enough :/ There are MOUNTAINZ of information available on the inter-web about the permanent residency process to thailand, what the requirements are, how it's done, etc.

Good Luck to the O/P in their endeavors. (y)

I would suggest anyone interested in getting P/R read this thread. I usually don't recommend the Thai Visa Forum, BUT this thread is very very useful for people on the road to permanent residency

-cameratas-guide-to-the-permanent-residence-process/

The big thing for P/R or Thai citizenship is the "unbroken" extensions of stays. That means you can't be on a visa where you leave and come back every 90 days, you can't have been on one extension, canceled it and gotten a new visa and extension. You have to have the extensions year after year unbroken. Unless I'm mistaken it's 3 years for P/R and 5 years for thai citizenship

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you can google that from thai immigration website - and how to obtain it - also use the search function in this group - been discussed many times