David you got a point and me thinking.
I don't know is the answer.
I love it, it is really easy and quick but even using 180 grit or finer.
I use a big bowl gouge and it is starting oi shorten noticeably, maybe it is because i sharpen more often.
Maybe i do sharpen too often because its there and quick.
Got me thinking though as its wasting money if i am sharpening too often.
Pete