I'm thrilled with my purchase. Not only does it last and last and last but it looks nice too. I run it off a usb powerbank all night because I have to sleep with a fan on and noise, it's perfect. It wouldn't need the powerbank in all honesty if I had it on medium but I don't I have it on max. I'm quite thin but I run hot so I like the comfort it gives. I love the noise it makes too. It's similar to brown noise.
Perfect for yoga too. I hate sweating, can you tell?
The speed increases is gradual and easy to use. The design is easy to clean and the price makes this a bargain.
I hope this helps