Good but you get what you pay for
Works well at first but PWM chip in battery unit designed to fail after several hours of use. I've gone through about 10 of these and the pattern is always the same. Will get dimmer and dimmer as time goes on. Not because the internal lithium battery wears but because of the PWM dimmer chip on the pcb. This cannot be replaced. Diagnosed issue with external charger, voltmeter and logic probe. Works well for around 6-8 months at 40 hours a week before it needs to be replaced. Charger port on battery pack is awful and contacts will fail quickly if you're not gentle plugging it in. Good for the money but manage your expectations. China budget item here.
Rating: 3 stars