Dumb question: does anyone actually regret buying an AI?
I can afford an AT currently.
Is the AX chassis that much better?
Nope. I got mine for $3700 with a bunch of extra goodies, and I don't regret it a bit. I do kinda regret selling the AE MK2 I had before in order to afford the AT, though. Would have loved to keep them both!
But I honestly don't feel slighted in the least. I don't really need all the extra adjustability or other doodads on the AX line. I did purchase a target buttplate to get cant and vertical adjustment of the recoil pad, but that was about $90 used. So I'm still around $2K or so under the cost of a used AX. I don't see what could make them worth that much more, in practical application. I love my AT, though!
ETA: @PBWalsh said it right, huge savings while still retaining the sexy thumbhole skins (which I rock, and prefer over the standard skins)!