David B, very valid points, unfortunately. Heck, if you wanted to buy a new track saw, and test out, Festool, Grizz, Makita, DW, Triton, Kregg and make a $1K buying choice right there on the spot for saw, blades, rails, etc, I doubt there is anywhere in USA where this would be possible. As you suggest, a trade show is your best hope. But unless u live in Vegas or Orlando, you will spend more on travel and hotel vs. the purchase price. This is our new modern reality. We all have reasons why we love and hate Amazon!
While these forums are helpful, it seems many people have forgotten that manufacturers and dealers often know more about these issues than forums. Why? Cause manufacturers like LV, LN, (and others) all experiment on ways to sharpen there blades, so they have more side by side experience vs. many forum contributors. Also, there is some great sharpening dealers who also do lots of side by side tests, such as sharpening supplies.com...speaking to them is also very valuable for specific issues as raised here.
I am glad others agree on how diamond stones fade way to quickly. Another product that seems perfect in so many ways, and it actually is, except for the non mention of wear and the cost to constantly replace the plates. Stones really are an amazing value and as good, or better than any sharpening method. There are exceptions, such as the VERY casual user, whereas a scary sharp, or granite or glass plate combined with papers can be much more cost effective vs. buying a lot of costly stones, holders, flatenning stones, etc. Other users are fine with just a grinder.