Tried the 4000s when they first came out after years of riding 3000s. They had low adhesion, and the rear did not make it 800 miles before it was trashed. I have heard they have improved since then.
Been using Bontrager Race-Lites, and now Hardcase. Getting 1500-2000 miles out of a rear with one debris caused flat in three years/9k miles.
Jerry