We just returned from 3 wonderful weeks in PV!! My ONLY frustration was from ATMs. Although we bring lots of pesos with us, it was necessary to hit the ATMs the last half of our trip and it was not fun. The 3 ATMS by the bank on Olas Altas were constantly empty or not working (when they were working the lines were long and sometimes by the time it is your turn the money is out), and also heard more than one case of having the transaction go through with no cash dispensed. We did not use the Cashola machines which dispense only american dollars (??). We ended up using the cambio to exchange dollars we had brought and also found another ATM where the line only lasted 15 minutes.
It just seems to be that it should be a little easier to get $$ to spend. Will have a new plan for next year instead of spending so much time in lines and trying to find machines. Maybe the answer is to just bring more pesos and cash. Be sure to think ahead a few days, especially on the weekends!
I don't plan on ever spending that much stress and time trying to get cash next year.