Service:
The plug Checker app works fine, but with the free version for 2 units did not get far. The "Premium" app is provided in a cheek, as that there is also there in app purchases for remote access. Under Premium I understand something else ... And for 6 you can expect the full functionality, I find. Apart from the fact that it still requires for remote access a second mobile device at home that the server for remote access is available.
Power Switch I have not tested, since I have no Android device with 4.0 and above.
What also works very well, is the ConnAir WebApp. For this purpose it is necessary to install a web server at home. These things I have tested this on a Windows PC. Advantage: Control is via the browser, making it platform independent. Is the entire first set, you can make many settings directly on the mobile device. Who tinker fun at itself, the view should be unconditional. The WebApp is free.
Coverage:
The coverage is better than with the remote controls with me. I have the Brematic upstairs are my outlets are all on the ground floor. In some, there are problems with the reliability of the switching operations. But I have to experiment with something with the antenna position and the location Bematic all outlets got it to work. However, the range depends always on the local conditions. For me, the more distant outlets switch tlw. Better. Since there may be also equipment tolerances among the recipients. I have 12 Funksteckdosen Toom (set of 4 incl switch 12). So are real cheap Dinger.
The Brematic is a very effective starter in the remote control via smartphone. Other products (eg Homatic) operate safely and have a better return channel, but also cost considerably more.