I have seen a number of videos where they seem to like Trend Diamond plates. (Rob Cosman and James Hamilton/Stumpy Nubbs) The plate they use is 300 on one side 1000 on the other.
On Amazon the plate alone is $114 and the kit is almost $150.
Cheaper ones were Less than thirty bucks, but reviews said they were not perfectly flat.
Before I looked at all this I used my Harbor Freight version with four sides to sharpen my planer knives. Seemed to do a good job but thought the Trend plate might be better.
I am wondering if I am over thinking this? Is the Trend plate that much better? Does it matter that much?