I have the set, What i got was to ride a chcocbo at lvl 17 instead of 20, nothingbig, but something.
No, that's not a benifit of the set. There is no benefit from the set. As long as you're taking a choco from one of the three main city stables, (Windurst, Bastok, or San D'Oria) and you already have your Chocobo License, you can take a chocobo as early as level 15, with half the ride time and with no effect from ride time duration increase gear. As I said, the full set of this gear doesn't do anything special at all.
I quit FF but Im still posting here to help you guys out.
If you are a WAR you want these unless you get LB, you should wear these until 21 when you can get Beetle +1, you may not want to get rid of them then either.