If you have a tight schedule and a lot of luggage, this is worth doing - otherwise it's probably just as easy and possibly cheaper to hire a taxi. There was some slight confusion as to the pickup point when we arrived at the airport but was quickly sorted out. The vehicle and trip were very comfortable. Airport to airport service without any hassles.
The limo arrived within minutes of my free call from the terminal building. The driver was personable and efficient, and a safe driver. I arrived well within my time for my flight.
The driver got me from EWR to JFK with no problems. He informed me there was a 20 toll to leave JFK and I also gave him a 20 tip. I hope the 20 toll was correct.