I do not know what a GS book is... can you enlighten me?
I use a laptop to do all my online reservations... my iPhone 5 screen is too small to read to be any good for me, although I do use it to tether my laptop for WiFi.
I reserved through ReserveAmerica two spots that are Fed campgrounds recently near and in the Everglades for January (6 month reservation window)... you are right there was no fee charged for the reservations, and my Senior discount made it priced right!
Last 4/1/2015 I used RA and there was no fee charged. I used it again just yesterday and I see the $6.70 fee charged for a FL St park.
I'm not bitchin... the FL St Parks have all been very nice and are reasonably priced for a "gated" community. I have never had trouble in any of the FL parks in the last 4 years that I have used them.