We're staying at the SpringHill Suites by Marriott in June. We have 15 people and 4 rooms booked. I have used the park n fly at both the SpringHill and the Fairfield (both by Marriott and almost right next door to each other) and I like them both. I generally book whichever one is cheaper for our stay. The SpringHill Suites sleep 5 (one on a sofa) and the Fairfield sleeps 4. The Fairfield does have suites, but they are not always available with the PNF rate.
Both offer a free breakfast, but it isn't a "full" breakfast. They offer pastries, cereals, fruit, yogurt, make-your-own Belgian waffles and some refrigerated Jimmy Dean sandwiches. It is definitely enough to satiate you before a flight but it isn't like a hot buffet.
The park n fly is a great deal, but it only includes 8 days of parking. If you are staying for 14 days, you will probably have to pay for the additional days at $10/day. Still, it's a good deal since you'll be getting the first 8 days included.
I'm assuming that you will be travelling in 2 vehicles or less. If you have more than 2, you will need to book one room for each vehicle.
The parking is off-site (either across the street for the SpringHill, or across the driveway for the Fairfield) and the parking service shuttle takes you to/from the airport. It is quick, easy and convenient, not to mention a great deal.