FWIW, Walker Brothers was on my short list for front and rear discs when I was in the market for race wheels. I later bought Zipp 808s when some came up locally for sale as they were a better value and only a few miles away and available (Walkers were on backorder).
Even after buying the 808s I was still considering getting front/rear discs from Walker Bros.
I've heard nothing but good things about them from Enduros and Sprinters alike.