The roller/drag-through thing is worthwhile owning, I use mine a lot more often than I get out the Lansky kit. It's probably a couple of times a month I'll find my usual knife is smooshing ripe strawberries or tomatos a bit instead of effortlessly slicing them, and a few swipes through the fine wheel on mine will make that knife slice nicely again. Mostly I get out the Lansky tools when I've damaged a knife, then I'll sit at my workbench will all my knives and spend an hour or two in a Zen knife edge grinding trance making everything stupidly/dangerously sharp. The ultra-fine ceramic hone in my kit does an amazing job, but you need to work up to it through the coarser grade hones - especially if you've been using the roller sharpener on that knife for a bit - I'm pretty sure they don't get the edge angles right in a way the the ultras fine hone can take advantage of.

I really like my Lansky kit. In retrospect I might have shelled out the extra for the set with the diamond sharpening stones - but I doubt I'll ever come close to wearing down the regular stones with my use patterns.