Just registered the product, and step 2 of the registration is a review. It's still too early to say. I purchased 2 of these. One sounds like the plastic it slowly cracking when it inflates. The other one sounds fine when it inflates. Pressure is good on both. Will make your fingers turn purple. Leaves imprints on your hands that go away in an hour or two. Doesn't really get the sides of your fingers or thumb, but you can move your hand around when it deflates so that the product can apply pressure to different parts of your hand and wrist. Charged to 100% and used at least 8 times and battery is still good, it's at 75%.