For me I was taught to sharpen with oilstones freehand with an edge bevel, then I read various magazine articles and bought waterstones (a lot of messy phaff), a basic honing guide (ok but no better than freehand) then a veritas guide (just couldn't get on with it) so now back to freehand on oilstones and a strop but can't get a really sharp edge hence watching the video and reading this. I can't justify over £200 on a set of 3 Eze-laps but am tempted to try the Vaunt stones from ITS.
By the way, if you want to test what you're getting, get one of your guides out - grind at 25, hone at 30 and then use some kind of honing compound on softwood or medium hardwood and freehand just the tip of the tool you're finishing. If something isn't sharp, it's generally because the edge isn't getting finished, but it may be at a level that you can't see with the naked eye.
I wouldn't bother buying a bunch of diamond hones, etc, that's likely not what's lacking.