This is ABSOLUTELY my holy grail.
The Saunan gimmick is the main highlight of this product.
If you're fearing that the temperature might be too hot for you to handle, fear not because it only increases up to approx. 15% (which is about 30°C on your face).
It's a spa-therapy, but at home. You can watch my video for my review! I am releasing a second one soon for your reference on how this product works!
Do Not apply this near your mouth area because when you wash, it's definitely going to somehow find its way to it and you're gonna be tasting the sea at that point 😂
But yeah apart from that, that's my only advice on what's "Bad". But it's avoidable!