I had to return the first Ziip Halo because it definitely wasn't working - didn't light up properly and didn't 'buzz' to indicate the different steps of the treatment. Now I have a replacement and I'm a bit paranoid that it's also defective. I just don't feel much at all when using it. Is that normal? The current is so faint. I can occasionally feel it on the upper part of my face but almost nothing around my jaw, even on the stronger treatments. I've seen reviews where people complain about the sensation being too strong or even painful but mine is far from that. Just don't want to waste my time if it's not doing what it's supposed to. I haven't noticed any results yet either but I've only had it a few days. Thanks for any advice!