Lots of people, although there were lots of counters opened. I was strongly recommended to add-on the Sunpass(9.99 plus tax per day). If you only use the car for a day and use the highway often, you should; for my case, I only used highway for one day, it was it worth, pay per use is a better option. Anyway, thanks for advising me the sunpass.
Easy going. I returned a little bit late as scheduled, due to the Miami Airport was hard to find right way to retal returns, I spent more than half an hour to find the drop off location, so I got one more day change on my card, but after having a good communication with customer service over the phone, I got money back for that in the next few days.
Good to go!