I use the free version, I don't see the additional value for the paid version, at least for me. I use the iphone app and find it useful for a single page glance at the whole trip, especially when my company does not book Hertz and I go to the Hertz lot out of routine.

That alone makes it worthwhile. Now anywhere else I would need to explain to someone why I didn't realize what car company I was booked on but here on FT many will understand...