I've had an 810e for a few months, and it's had a lot of playing in that time. Before I bought it, it had been hanging in the guitar shop for a while (several months, I think), and I imagine must have been played quite a bit by customers. I knew, after playing it for a while, that it was close to being my imagined dream instrument, so I bought it.
Of course the shop replaced the 810e I'd bought with a new one, which I tried on a subsequent visit, not quite fresh out of its packaging, but not far off. I was shocked by the difference. It sounded ... thin. What I loved about my 810 was its bloom; its chiming treble, delicate as bells; the room-shaking bass which was there when I asked for it. The new 810 in the shop was a nice guitar, but I couldn't have fallen in love with it.
Of course it was a different guitar - it wasn't my guitar. But what's interesting is that it's still there in the shop, now, weeks later, and it's definitely opening up. It doesn't sound as 'stiff'. It's slowly acquiring a bloom, a resonant, rounded chiming character of its own.
I'm uncertain about the claims made about improvements that occur over many years, but in the shorter term of weeks and months after new, gosh yes, very nice things really do seem to happen.