You can easily embed the emulator on your website and you can also connect to it from your local computer to use the "dab" tool with the remote application.
Developers have only to upload their APKs and decide on which emulator they want to test their applications.
It would be useful to have the possibility to use the application simultaneously on many emulators: so far I haven't found this option. Besides that, having the possibility to keep the application data stored between a session and another will be appreciated.
Generally speaking, the utility is useful especially to test the look&feel of your activities (or mobile website) on different resolution and to embed the application on a website.