[mwcampbell]

Care to list any of those alternatives? I imagine a lot of companies will use Amazon's device farm simply because Amazon is so well-known.

[j_s]

The primary reason to use an alternative is iOS support.

https://appthwack.com/

http://keynote.com/solutions/testing/mobile-testing

http://mobileportland.com/device-lab

http://perfectomobile.com/

http://testdroid.com/

http://xamarin.com/test-cloud

etc.