I purchased a Stagg system about 8 months ago and have been experimenting with it since. For me, the brewing chamber is too narrow to agitate the slurry properly (...I like to stir aggressively!) although they do make a shorter brewer now which would be easier to make sure everything is saturated. In addition, the filters included were not cut very cleanly, papery, and difficult to separate, almost like AeroPress paper. That said, I think the star of this system is the kettle; it's balanced, has great weight, and so far, excellent build quality. I use it for nearly all of my pour-over brewing now with excellent results.
I did find I had to grind a little finer as compared to a V60 in order to slow down the flow rate and hit the brew time I was aiming for because of all the holes + ridges in the bottom. To be honest, if they could fix the filters, I think I'd use it a little more and overlook some of the other things.