The new bluetooth sensor is compatible with both Apple and Android devices. If you have an iPhone, you also have the option of the lightning sensor. The emWave2 is good to use while working at a computer but is inconvenient and not portable compared the the device connectable sensors. As for the technology I believe it is effective and of a high quality. The Inner Balance app (a free download from the iTunes or Android stores) is great and has all the information and recording options that 99% of users would need. The other 1% at the extreme end of the biohacking spectrum would enjoy the games and more data that you get from the emwave2 as well, but to a lesser extent.