Has anyone tried this layout yet?
Oooh, be careful. There could be all kinds of nasties lurking in the translation from Eagle.
Where the above is useful includes the ability to leverage Altium to explore the schematic and PCB using cross-probing, chasing nets, component placement, and the like. Plus, it's my personal opinion that my schematic layout is easier to follow.
I would not recommend trying to generate another pcb from the translated design without checking every little bit very, very carefully. I have not done this. Nor do I plan to. I know for a fact that lots of non-copper bits on the top layer were imported as copper (all of these would need to be remove/fixed/redefined).
And, as mentioned earlier, no polygon pours (copper floods) were imported. You would need to define and generate those.
In addition, if I were to spin a new pcb, I would definitely route the board myself. Much the same way that I prefer my own driving over the rest of the human population.