, have been using them for many years now, they work great. I only use a mini lathe but they are perfect for this. With inserts, sharpening is a thing of the past. They work great on all metals if you set the speed and feed properly.
The included TCMT insert doesn't even seat properly, it comes with a pretty crappy looking 2mm hex head screw instead of the expected torx and the shank it's cut from feels feel hot . rolled mild steel. I probably got a particularly bad file for my <$5, but the file fixes it well enough to save me five bucks.