All of the perks that came with my flight — complimentary checked bags, Wi-Fi, snacks, and drinks — combined with the ease of getting on and off the airplane made me feel like my ticket was most definitely worth the extra money.
Plus, on regular commercial flights, I feel like there are hidden fees everywhere. It's often going to cost you extra if you want to buy a glass of wine and snack, check a bag, or even just make sure you won't get a middle seat.
I didn't come across hidden fees with JSX (and didn't worry about getting the middle seat since my plane didn't have any) but keep in mind you do have to pay extra to pick your seat if you want a specific assignment with the line's basic Hop On fare.
It was also neat that I was able to earn some United MileagePlus credit on my flight since JSX is partnered with United and JetBlue loyalty programs.