I used them for a while, but found they are harder to follow a line with as they tend to wander a fair bit, also they didn't keep their edge as long as an FD UR blade, so I went back to FD blades. Lastly Mikes Workshop can sell me a gross of blades cheaper than I can get them from my supplier over here and they get here quicker than my UK supplier can get them to me. (Mike's postal charges are cheaper too, he charges only $3 but my supplier over here has a standard ?4.99 delivery charge)
Keefie.