Reminds me of my old Motorola Atrix [1]. It had a laptop docking shell that booted a restricted version of Ubuntu alongside an instance of Android. It was totally cool, and everyone that saw it was amazed. However, actual usage was another story. Tegra2 just wasn't powerful enough to drive Ubuntu and Android concurrently in a usable manner.
Our code runs fairly well on the Nexus 4 today, and through much dogfooding, we've learned that RAM is the biggest limiting factor in performance. So when (if?!) Edge ships with 4GB of RAM, the desktop mode will fly.
[1] - http://en.wikipedia.org/wiki/Motorola_Atrix_4G