and not so expensive.
But after testing with a studio model house, I felt 3D viewing was a bit frustrating...unlike the Sims, the walls disappearing option wasn't there, and I think the walk mode really can be improved more.
I couldn't enter my studio house for about 10 minutes, then after finally making it, the narrow entrance just blocked me up.
Except this not so easy as it looks 3D mode operating, this tool was funny and pretty...maybe I should have chosen bigger model house.