For what's it worth, I really enjoy the ATT Calypso Regular plate - a lovely smooth yet efficient shave. I understand that Blackland have bought ATT and are planning to relaunch some of the ATT line.
The Hone 15a is also a great razor - beautiful, smooth and efficent.
The makers of both of those razors first made stainless steel and brass models before designing and producing aluminum versions - both noted the difference in designing and producing razors that would perform well in that material. It sounds as if a lot of effort went in to produce alumnum razors that stand out on their own in terms of functionality and asthetic.
Final thought - when you hit the sweet spot with the ATT it sings lke a bird - as every YMMV.
All the best,
Chris