I found the reports and videos from reviewers to be accurate --
i. e., good third-row head and legroom, even for very tall adults. The second-row seats have quite a range of fore/aft movement. It took running the second row all the way back to touch my knees in the third row. But there is
plenty of room in the second row to keep those seats well forward, which left plenty of legroom in the third row.
However, the bottom seat cushions were extraordinarily short in terms of thigh support. This is probably the price of folding those seats into the cargo floor. But since so many EVs jack the knees up due to battery modules under the floorpan, EV rear passengers are often used to not much thigh support. The leg drop in the Gravity third row, however, was actually pretty good. The short cushions might make the seats less comfortable on a long ride but are probably not an issue for shorter durations.
I no longer know what to think about the ingress/egress issue. I certainly found it challenging in this prototype, but posts by
@borski and
@hydbob, who have been in later production versions, found it less daunting. And, as I noted earlier, with only one exception the reviewers have been notably silent on this issue. This might have been quite an early beta prototype. It didn't even have the bronzed glass cover in the front console that showed up in the L.A. show cars almost a year ago.
It's been a while since I test drove a Model X. Even so, I still remember the third-row seating as abyssmal. In fact, the second row was no great shakes and, confoundingly, its bench seat was more comfortable than its captains chairs. (You didn't ask, but the Gravity second row absolutely blows the Model X out of the water.) The Gravity third row is actually usable for adults. I'd put it on a sliding scale. For starters, everybody fits. But the smaller and younger you are, the longer the third row will be comfortable on a trip.