Good device for home use, but the laser seems to have a weaker effect than the effect you get in an aesthetic clinic which is expected. Safety wise I'd give it 5/5. Sometimes it doesn't start easily I'm not sure why, I'm afraid it will stop working as I previously read reviews that this device had stopped working before it's expected expiry age, I think I will have to wait and see.
It has 3 settings/strength and I was impressed that the 2nd and 3rd settings are actually quite powerful and a test is a good idea before using it because you can end up burning your face!
A downside, is that the rounded application part at the top can heat up significantly and stays hot which I found quite painful even when the device doesn't (ignite) any laser energy. You will need to use ice or a cold air current with the device to avoid a burn.
Ergonomics is excellent, I love the design and it's very easy to hold and apply anywhere on the body. It's also lightweight which is perfect for travel.
I gave results a score of 3 but I'm using the 1st only until now and have just decided to step up. I noticed the hair growth is less overall, but the stubborn thick hairs probably need higher setting.