I don't have that tool, but I do have the HF chain saw sharpener, which does great on my chain saws. From what I have read from others, it takes some precise settings to work correctly. With the price of sharpening (and distance for me) I have been considering that sharpener.
The negative that I hear is from a few that treat the tool as if it were a strong solidly built tool. At this price, it probably is not. - BUT, careful handling, along with - be precise, be patient and be steady and it should work. I have used my chain saw sharpener much longer than what some people on other forums have said. That is because I don't rush things. I think that the circular saw sharpener is similar. That said, one can still get a lemon, and HF does seem to have a little higher percentage of lemons, if you know what I mean.
BTW, for my hand held circular saws, I usually buy a new blade but for my 10" table saw, I need to be re-sharpening those blades rather than buying new ones.
