Yes, I use both. I love the FD UR blades, but sometimes they are too aggressive, so I use Olsen reverse blades when I need a less aggressive blade. Also I can't get the FD SR 2/0 blades to track properly for me so I use The Olsen 2/0r blades for very small cuts.
Neither brands do every thing I need, so I use both for different uses.
As far as fuzzies on the bottom, Both brands do the same for me, so that is not an issue.