I've had good luck, I've had bad luck.
Best luck on rare mounts was getting my green proto on the second egg for my Lock. I was fully prepared for my weekly disappointment, and quite relieved to not deal with that nonsense.
Worst luck so far has been my repeated Sethek/MgT runs for the Raven/Chocobo. My Pally does can put up his 30 minute seal at the start of Sethek, down the bosses, flap to Shat, portal to IQD, then down Kael and have ~10 minutes left on his seal, so it's not like these runs are terribly taxing, but they are starting to get a tad irritating. And to make matters worse? After having my 3rd phoenix pet drop while doing yet another daily attempt, my wife, being a pet collector, wanted the pet. So she took her SP through there. Yesterday, on her 3rd attempt for the pet... she calls to me in the other room, with this apologetic voice, "Honey?..."
Yeah, the chocobo dropped for her. But not the phoenix, naturally.
RNG is a bitch.