Josh, I have a 6 x 1.5, vintage blue & yellow (bonded, not natural). I love it.

I don't hone as often as you so I can't say how fast it wears. I think I've read posts by both Lynn and thebigspendur saying they wear very slowly.

I think what you're going to find however is that the blue is much slower than the Norton 4K. The small yellow will be a great stone for you to finish up smileys and warpies, but if you're doing lots of razors for other people I think you'll find the blue side trying for basic bevel work. Randy stresses that the slurry is all-important in making the blue side a more efficient working stone.

Good luck.