First I am not downplaying TT engines as I have no experience with them.

The AX engines are ABL plated and not ABC as FX were. I also have seen no problems with either BTW. I have heard that some have had trouble.

The discount is nice for you but I don't believe worth flying to Australia to order an engine. Nor am I going to worry about the relatively small difference in the U.S. to determine MY choice.

I certainly find the AX among the Best-Bang-For-The-Buck engines.