Sorry for the late reply. For cutting narrow pieces it would take quite a bit of setting up.
The main issue with the fs-ag-2 is, that the height of the fence is 35 mm, so when you have to cut stuff with a thickness lower than that, the edge of the workpiece has to extend over the cutting table.
I haven't used it for miter cuts, and certainly not on narrow pieces (I use my mitersaw for those).
I haven't used it much, because when I just got it, I wanted to use it for a built-in closet; and I couldn't get it to cut square, then I brought my mft3... and I couldn't get that to cut square either... (which wasn't a problem in the past)... It turned out my 3000 mm guiderail was the problem... it had gotten very slightly bent. I finished that project with coupled shorter rails, but since I had my mft set up by then, I used that on the panels.
I do use it once in a while, mostly when I don't want to set up the mft3; or when the panels are just to wide to cut on the mft (I only use the 1080 rail with my mft3).
I don't find it practical for narrower pieces, because it turns it into a bit of a balancing act, (I haven't made a very short guiderail, so I had to use my fs800) certainly not as practical as the mafell kss saws, where the saw is attached to the rail and has a spring action.