Yes, the ATMs are in a small building about 7.5km or 4.7mi from the roundabout on the east side of the road. My experience has been that them working and having money in them is 50/50.

The ATM at Times Square is even less reliable in my experience.

The ATMs at ScotiaBank at the roundabout are pretty reliable except seem to run out of money on Sundays.

Even with the fees, if you do the maximum withdrawal (30,000 JA) you end up with a better net exchange rate than if you bring cash and exchange at a cambio. My bank charges me $1.50 and ScotiaBank charges $4.50 US ($563 JA), but then I got the straight bank exchange rate. The net was:

Withdrawal: $30,000 JA (received from the ATM)
US $ withdrawn from my account: $246.33 plus $1.50 charge = $247.83 (this included the ScotiaBank fee)
Net exchange rate after fees: 121.050
Official exchange rate on date was 123.242
Cambios were offering 115.15