i hate giving anecdotal evidence, but i wasn't expecting it to be such a black and white change for me personally.
i can draw a clear line between the previous twenty years of my life, and a few years ago.
it's just weirdly amazing to able to have a small thing go wrong and just be like "ah dangit." rather than having a depressive spiral and mourning my own existence for the rest of the day.
not that i don't sometimes have pessimistic thoughts or bad days, it's just not overwhelmingly defining of my every moment.
at the very least, i'm eager to see a lot more research being done. if it is legitimate, and others can have the same change in life experience that i've had, then it's a damn tragedy it hasn't been studied more thoroughly ages ago.