They're also a work laptop option for Google employees.
Yeah, the pixel line of devices seems in part to be about weening Google off their Apple product addiction. Never mind dogfooding their own software products.
out of curiosity what is the model of choice internally?
I'd expect it to be the Chromebook Pixel.
FWIW Friend of mine at Google could not get a CB Pixel. Are they supply constrained? Anyway, he was mad at Apple for such a long wait for MBP updates (6 months ago), so he purchased a Razer Blade Stealth and loves it.