Fits my street 13 well, with a little play in the heel, but 47 is too tight. There are tiny differences between L and R, but they are handmade, so there's that.
Warm as heck, didn't heat mold, and have seemed to form to feet just fine after several uses. Might mold down the road.
G12 new-matic crampons fit well, but if rear adjuster is fully open, otherwise it bulges the rear welt, and am a little concerned it might be too much tension and wear out that attachment point.
Would probably replace in kind when the need comes up!