I just entered through Suvarnabhumi airport, longer queues for sure. I use visa exempt every month but never had any extensions and max stayed 4 to 12 days each time, and return back to my country. I had zero questions asked and was let through. This was my 12th Visa exempt this year. Never even asked for my return ticket, hotel or how much cash i had. Just biometric, photo and stamp the passport. Since there are many questions around this subject.