The emulator can be found at genymotion.com.
I should preface this post by stating that I have only used the Genymotion emulator for around twenty minutes, but it has already impressed me to the point where I would consider using as my main app testing device (I currently use a hardware device).
I have a few problems with the official Android emulator:
- Hard to enable x86 emulation on Linux
- Difficult to spoof GPS coordinates
- Not very user friendly
In the short period of testing Genymotion, all of these points were resolved.
Installation was literally less than five minutes, the emulator ran buttery smooth, and there were lots of configuration options for testing and running apps. It even comes with images that include the official Google apps so you can essentially use the emulator like a regular hardware device.