Get the Spyers, NO doubt.
I am on tour now on a 120 lb heavyweight. Before I started I made, for my custom steel frame, a diy ALu wishbone and steel bracket. I found a great welder in Seattle. I then got compressionless cable and a tandem HD cable. The IGH expert then said my SA long pull levers wouldn't work. LOL.... I put it together myself. I also defied normal and maxed the pad gap, 1 mm each side. Because they are designed for a track dropout and I don't want to fuss with it ever.

My Motel was right on a steep hill. I got up some speed and instant success. With the lever half cocked it was like glued together and the tire was burning rubber. No break in, no cleaning the disc required. NO slipping or squeaking at all since. I expect it will go 10,000 miles now.
My 2002 hybrid DB5 one side pull discs were at best 30% of this Spyre. Pathetic.