You also have nothing to lose since you can try it for 48 hours and if you don't feel it is worth it they refund your money. I don't know any other upgrade that you can get a refund like that.That would be awesome if the rumor was true. I wonder if they'd be willing to go to 2.6? That would be a half second lower which is inline with AB upgrades.
One concern of mine with AB on the LR is that, yes, you get the improved 0-60, but from what I've read and seen on YouTube videos, the general consensus is you don't get that full useable torque at all speeds. Meaning it's boosted down low but not across the entire spectrum. It still feels worth it for a cheap upgrade compared to the work you'd have to do to an ICE for similar 50hp gains, though.