Nah... I've seen the Panthera in stock via the website store locator for upwards of a week now and I keep, THANKFULLY, rationalizing myself out of the purchase because I really cannot at all convincingly express any dissatisfaction with the T7 stick.
It's sort of a collectors impulse more than anything right now, same kind of impulse that got me purchasing a Madcatz Tournament Edition S stick back in the day when I had a perfectly fine Tournament Edition already -- I saw it on the shelf and was like "that is one cool piece of kit" and bought it despite not having any issues with my existing stick. In fairness, I did use both sticks pretty often back then, but I never needed to. And personally owning two sticks and being able to share one with a friend for multiplayer only ever came in handy once.