The only one I'm familiar with is Omron and my family that has it hasn't had any issues with it. Maybe someone else that is more familiar will chime in.
I actually went with the Omron 7 Wrist and an app called Blood Pressure Companion. It has many great features that I will expand on later in another thread in the apps section of the forum.
As far my knowledge is concerned, Omron is the only gadget that helps you out in monitoring your blood pressure with perfect accuracy. Please give a try & check by yourself & see the expected result...! Best luck!