Using WebPageTest on Saucelabs

Does anyone have any experience using Saucelabs as the agent for running their private instance tests?

ive the same problem and like to use mobile devices.
I irritiert about appurify/google. I cant create api keys/token to use it.
Id need external mobile tests but i found nothing whats compare to saucelabs/appurify and works with webpagetest or standalone.