I’ve only used the M10x1.5 tap so far but I cut 20 threads in 6061-T6. The tap still cuts as well as on the first one. The set is quite complete and a great value. I’d buy it again.
Seems good quality and selection for the price, however the container is very misleading. It's not a bifold tray as it seems, only the lid opens and you have to fumble to get the top tray (made of thin plastic) out so you can access the second tray. Not very convenient.
Good so far. All the pieces were present. On of the dies falls out of the case and doesn't fit right but other than that, it is a very complete set with lots of sizes that should cover everything I might need. I will update if I have any issues.
Mike 
