Both my second (from REP) and third (from RGN) arrivals went on pretty smoothly. You can get the VOA as many times as you want. Also, I did not wait more than 15 mins each time. They even announce on the board that it takes 1 min per person but actually it takes a bit more. All visas to Thailand were free until March 31 so it did not cost me anything, except a little extra wait time.