I'm with Ole in that I recently bought the Harbor Freight sharpener after watching many YouTube reviews and modifications. Their design is loosely based on some much more expensive European machines. Being a machinist as well allowed me to make a couple of rather simple parts allowing setup to be much less finicky and more solid.
I like using the Kempston rip blades on my TS and when the first one became dull I just ordered another due to their low cost. So that was my first "victim" to practice on but the resulting burn marks were disappointing. I remember one reviewer complaining about the coarse grit disk (probably 100) that comes with the unit. So I ordered one of those slow boat from China 600 grit disks and that made all the difference.
Scrap pieces of 4/4 red oak and 6/4 ash were ripped and the finish was silky smooth. I've since sharpened one of my dull Woodworker II blades and rips and especially crosscuts were as good as a new blade. Using a 25% off coupon (HF New Years sale) I'd say the $30 I paid for this sharpener was well worth it.