The Push2TV is the best I’ve used (used the Samsung adaptor too), but it is still not 100% reliable. Mostly random disconnects and artifacting. Using various phones: Galaxy S3, an S4 and the new Nexus.
To be fair though, with each firmware update it does get better, so hopefully they will one day have ironed out all the bugs.
Just be aware it is still fairly cutting-edge technology, and can’t fully be relied on.