well, after flirting with nike+ perfection for 12 miles the other day, it reverted to form today, logging my ~4.5 mile run close to 5 miles. The only real difference is that I was running a lot slower this morning (dead tired!).
The nike+: accurate at any speed you want, as long as it's the speed that you calibrated it at!
The nike+: accurate at any speed you want, as long as it's the speed that you calibrated it at!