Well,my last extension in Jomtien in late March took exactly 1 hour. I walked to Bangkok Bank to get my bank letter,then a short walk to Kodak Express for a last copy,then another short walk to immigration. I started 9:30, (my branch open 10:00), and left immigration 10:30.
You get through immigration faster,but that's basically all. You're paying a lot for a visa just because you haven't reached 50 years of age.Imo, a waste of money since the DTV was released.