I've used a diamond chainsaw file that I got off Ebay years ago, but I've never seen those diamond stones from Eze Lap. I bet they'd work better with my Dremel chainsaw sharpener than the stones that come with it.
Then again, I have both the Oregon and Granberg jigs and just last night, I bought a pair of Jonsered sharpening kits. They're the same as the Husqvarna kits, with two round files, one raker file, a file handle, and the guide with rollers. Can't wait to use it.
Some things to be mindful of with diamond abrasives are: Don't use too much pressure and don't use oil for a honing lube.