Amazon Unbox rental — never again

Rented a flick on Amazon Unbox last night — it downloaded fine to my Tivo and it looked fine, but the 24 hour exploding limitation is beyond stupid. We regularly watch a movie on two nights running, half each night, but this is impossible with Unbox rentals thanks to the fact that the movie explodes in 24 hours. I can pay the same price and buy a movie off Tivo PPV and keep it forever. This unbox thing will be a failure until Amazon can get DRM straightened out.