Totally unreliable.
A nice idea, but completely unreliable. I tried to get this thing to work properly, but just couldn't. I first thought it was because I have big wrists and it didn't fit very well, but anyone I asked to try it got the same bad results. The readings were all over the place and totally off the mark. You really had to guess if what you saw on the display made any sense, so to me this was useless. I promptly returned it for a refund and got a unit that goes around your upper arm which worked much better for me.
Rating: 1 stars