Bloodhorse has a good article.
"This year Baffert showed up with Juddmonte Farms' Arrogate—a colt previously untested in graded stakes competition—and blew apart the 3-year-old division with the fastest Travers performance in 147 years of history, and a new track record for 1 1/4 miles at Saratoga Race Course."
Juddmonte's president said "He's obviously the best (dirt) colt we've ever had."http://www.bloodhorse.com/horse-racing/articles/214577/arrogate-blazes-to-travers-record
As far as my own "impressive scale" rating goes, Arrogate's performance in the Travers ranks right up there with Arazi's Breeder's Cup.