I just finished it.
I tried last night, around 10:00 p.m. Eastern Time, but it was very, very slow and kept timing out. Also, it seemed to think I'd clicked different answers from the ones I clicked on. (I wish there was a way to see what responses their server thinks you've selected.) My guess is that that was prime time for trans people filling it out (especially west of us) and the server was overloaded.
I tried again at 5:00 this morning and it went a lot faster.
Also, I had trouble with some of the answers because I'm in the middle (well, more like beginning) of my transition, and it seems to assume everyone is either pre- or post-transition (if they're transitioning.)
And I realize that because gender is, for me, a weirdness that society imposes on me and not something inside of me, it's hard for me to classify the ways I don't fit in as "related to being trans" and "not related to being trans." I've known as far back as I can remember that I wasn't the way I was supposed to be (because every person I met made a point of telling me), but I didn't try to classify any of it as gender-related until recently.