I have Keos also and don't use covers. The cleats are $20 a pair - I get about 3,000 miles out of the right one (the foot I put down at stop signs, when obviously you can't use a cover) and about 6,000 miles out of the left. Covers aren't worth the hassle or the pocket space, IMO - I've already got enough cr*p in my jersey pockets, and I definitely don't need stuff tracked up off the ground in the same pocket with my lip moisturizer, chamois cream and gels.