They are absolutely fantastic boots, I've not got safety clogs but I've a pair of normal derby boot clogs going on 4 years old now, still basically mint condition (with a bit of looking after).

The clog sole takes a bit of getting used to apparently - I didn't particularly notice but I went from 7 years of no shoes straight into clogs and they felt the most natural thing in the world to me.

I'm guessing the low relative price is because unlike conventional shoes there's no challenging sole stitching as the uppers are nailed to the soles.