Instruct: Classify Amazon reviews into positive or negative sentiment
Query: lower back massage doesn't seem to work

I just bought this and it works pretty well on the whole. The upper back doesn't reach as far as i'd like but it's a minor quibble as it does hit the muscles behind the shoulder blades. That is a key sore spot for me most of the time. I also wish it hit the lower back more solidly.The only real problem is that the lower back feature is virtually working as full back massage. It doesn't stop and go back to the lower position, just keeps going up. It doesn't go as high up as the upper back or full back mode tho.The display model had the same issue and I'd hoped it was a malfunction from misuse/abuse in the store but a brand new one proved to have the same defect. I will call Homedics and see what they have to say.On the whole tho, it is a good investment. I also want to add that I agree with those who state it does leave you feeling somewhat sore and bruised. I imagine tho that will fade.