sharpening ideas?

[dtec1]

Hey guys so one of my friends asked me about these knife sharpeners. I have never used one of these. Its the work Sharpe system. Looking at it its got me a lil curious. SO the 2 links below are what jantz has the first one is I guess the main part of the machine and then the second one is the ken onion attachment. It seems a lil pricy the attachment is more than the main machine... So just wondering if its any good if any one has used one. Also it says it adjustable for all these different angles so that would make you think it would be a flat edge bevel and NOT a convex. but looking at the pictures it doesn't seem it has anything behind the belt and that would make you think it would come out with convex. My firend brought this up but if it was a flat edge bevel I might even think of getting one for myself. I can do a convex on the belt grinder and I have the edge pro for flat edge but it would be nice if I had another quicker way of doing a FLAT edge bevel. Customers knives would always be done on the edge pro but some times I wish I had a quick way to get a flat bevel sharpened quickly....if you guys don't know much about this any other ways or systems that make it quick to get a flat bevel???THANKS GUYS!!!

Machiene----- https://www.knifemaking.com/product-p/wsktsko.htm

attachment----- https://www.knifemaking.com/product-p/wsbga.htm