Arx offers cast baskets on the midwoofers at no extra cost, plus XBL2/splitgap technology. And they are cheaper than Axioms compariable models. Plus the planar tweeters use neo magnets which is very expensive right now.
But stamped can be very good too, but I think maybe Axioms current driver tech just doesn't benefit from die-cast some other woofers do.
Theres a big difference between upgrading from a soft dome tweeter to a planar transducer like the Ascend offers. IMO theres a huge difference between domes and planars, planars to me reproduce strings better and offer higher peak dynamics than domes do.
