The Sram Red D1 short cage Rear Derailleur is still the best out there!
Glad I could find it at Wheels & Sprocket Outlet for a fraction of what they regular sell for.
Even though the newer Red E1 is marginally lighter, it only comes in a medium cage (36t) version.
If you run a 10-28 Cassette (or even smaller) you don’t want a medium cage RD. Shift quality with a short cage is just superior.
It was quickly shipped (in bulk packaging mind you, but that was completely fine with me). And even came with a receipt inside the box, which is always nice, should you be in for a warranty claim.