Sailfish itself is much better than anything I have ever used - it's clearly designed for touchscreens. For hackers it's awesome because it's actually a Linux, and you can access shell (as a root, too).

Android support is a bit buggy though - for example Skype sometimes breaks (can not send messages), but Spotify and WhatsApp have worked perfectly fine.

If you are interested in it, they dropped the price a while back (down to 250eur).