Quality is good.
It starts the alarm after 100s, not 1 minute. It doesn't get louder and won't do V sound even after 3.5 minutes. It won't detect smooth changes. I tried servo test constantly rotating the servo and it started the alarm anyway. After some testing I found out it needs change in pwm to jump by at least ~80uS in one step. Didn't try real flight scenario yet but it should work. Delivery took 2 months.