I love the slick. I really did not start to use one for awhile and then was nudged to pick up the tool. I like to use it on mortise sides. If you mortise needs a little more width, you are only tiring your self out if you aren't using the slick. Big cutting edge and mass. Thrust it down the mortise and your done.
I put a radius on my straight edge Barr slick. I also had the smithy straighten up the whole tool a little bit so dropping plumb was easier to reference by eye. For the radius, I spent some time with a file. To sharpen, I like to take the stone to it. Slipstones work well.
