Just got mine in yesterday or it was the day before, either way it's a pretty good system. Just a heads up though using the sharpie trick is very helpful with this system. And don't get carried away with being perfectly vertical in your strokes, it's more important being consistent than maintaining that. So if it feels natural to be off a degree or two but your consistent in that I wouldn't worry about it as consistency is key.
I can tell you I have a slight habbit of making my blades slightly more shallow of an angle on the left side but I seem to be very consistent in that with this system, but almost perfectly vertical on the right side. But as long as I do my job as a sharpener I can get the blade sharp enough to push cut circles in receipt paper.
Also try not to run the blade off the edge, lift it off before you reach the end of the stone or don't remove it off the stone and work the blade in an up and down motion. Whatever feel right to you. But if you run the blade all the way off it you will end up rounding off your tip.
And don't forget you can set it up to use as a benchstone which I have done a few times already though my personal preference so far is to just use on side on the top side instead of two and use it that way. And anti-skid pads on the bottom help out a bit in keeping it in place, or you can use a drawal mat to help keep it in place so you don't have to worry about it moving as much even though you probably end up holding it while it's in use.
Oh and lastly it does live up to it's hype both good and bad. It works good but is a PITA to reprofile knives to work on those preset angles but you can prop up a stone along it so it's at the same angle and secure it down there to reprofile or buy the diamond or CBN rods to reprofile or it may take awhile if you have to remove a lot of metal. Right now I'm currently experimenting with the idea of just using my SIC Norton Economy stone propped up against it and the one or two knives I tested that setup on worked well. Tried using a 4in diamond stone from my DMT Aligner with it being secured by a rubber band but it felt too small and a small slip sliced the rubber band off with ease, a 6x2in stone seemed like a better size to use.