Hands down, the best pair of boots I've ever owned, Jez. LONG break in period! But, now they are an all day boot. No foot, heal, or back pain.
People are surprised there is no insole. Its all leather (~7layers of leather above the Vibrum heel to your heel.)
My theory, those padded insoles are too soft & get your feet shifting every step. Then you use your muscles to correct the shift. Muscle fatigue.
If these go on sale again black Friday/cyber Monday I'm ordering another pair.