I have the DW 733 planer with resharpenable knives, and I have a spare set. Have always sent them out for sharpening, which works ok but costs about $25 including shipping. Then I saw Willian Ng's video on sharpening (it's worth watching for entertainment). Followed his method, it took me an hour to make the fixture and about 40 minutes to sharpen both sets, including removing and replacing. I am able to get them sharper than the pro I had been using and it will take about 10 minutes just for sharpening a set. This is a big improvement. It's now practical to sharpen often.