I really like Project Farm but while he does a great job overall he uses the same approach on everything even when it doesn't necessarily apply. I've used the Sharpmaker before and used to have one. My guess is that he doesn't fully understand how sharpening works, particularly with regard to the burr. Also there's a human factor in using them, especially the Sharpmaker. The Spyderco sharpener is relatively simple but there's still a learning curve and some technique involved. There are also issues with simple testers like he used.

The Sharpmaker works well IMO but it's slow if you need to reprofile a blade. I didn't have the diamond rods which of course would speed up the process. The tool is best used for touch-ups and you're best not letting it get too dully.