First mechanical keyboard that I own, but I've tested a few i the past. And I'm not so impressed, especially for a reputable brand such as Filco.
Construction quality seems far from high. The keys wobble if you move them from the top, especially the space and Esc (though this now seem to affect typing experience). Also, my standard of comparison are not mechanical keyboards, but mostly the Thinkpad notebook keyboard and the apple aluminum desktop keyboard. Both gave a sense of well-make that is lacking in this keyboard.
The keys themselves seem a bit undersized to me: I have large long fingers and I'm used with thinkpad and mac aluminum kbs that I know have kind of oversized and ovespaced keys.
Also, the MX brown switches seem at the same time kind of mushy, too deep keypress distance (from my prev experience with good quality notebook keyboards), too noisy (though the noise seems to come from keycap hitting backplate or something, not the switch itself) and not crisp enough (yeah, they are tactile, I can feel with certainty when the key was pressed, but they feel a bit too linear in response or something like that, it's hard to describe, there's not that 0 or 1 feel or completely pressed or not pressed at all, nothing in between).
This sounds pretty self-contradictory, I know :)
I guess the idea desktop keyboard for me would be a desktop version of old-school Thinkpad keyboards (I think they had spring + scissor switches?). Don't think this exists, though.
But overall, this is a solid classic desktop keyboard and mx-brown switches are great for precision typing, nothing to reproach here.