I'd give it 3.5 stars, for its price vs what it does, honestly.
Cons
-The unit is on the narrow side, so you're unable to spread your hand/fingers out and your thumb winds up tucked very close against your hand which is also clamped shut. I got the unit for arthritis in my thumbs, and I'm not able to get the benefits I was hoping for.
-If you're looking for "massage", it will disappoint. It's a single buzzy rumble style 'massage' that doesn't extend throughout the whole unit.
-Compression. Realistically it's concerning how much pressure is exerted. Please see pictures for what the 2nd highest setting will do to your hands. So... Be warned.
Pros
-It will squeeze the ever loving heck out of your hand! If you're looking for straight up compression, this is the ticket.
-It does not need to be plugged in to work, the unit is USB C chsrging battery so you don't have to be tied to a plug in
-Heating does a decent job