IMO, good quality and workmanship especially for the price point. I have not done (nor found it necessary) to any fretwork. I did adjust the nut and saddle heights, but that was just personal preference and nothing you wouldn't do on most mass-produced instruments.
My only complaint, FLOABW, is the buttons on the tuners have a sort of satin feeling material on them which were fine at first, but after about 2 years started to feel a bit sticky to the touch. In the end, I had a set of 3 x 3 tuners in a box, so I just put them on rather trying to source new buttons that would fit. (dropped right in btw)
Apart from the funky buttons, the tuners worked great mechanically. Smooth, stable...
They may have changed the hardware since I got mine in 2016, but I don't know for sure.