Features support is a very critical thing to consider. Thank you very much for your valuable post.

For everyone, here is the documentation for the feature that Alexiy has highlighted, make sure to look at the restrictions section:
http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fs_pbrsv.html

I hope that I’ve been informative.

BR,
Mohammed Mahmoud.

I was investigating this topic as well. And it happened that this feature is not supported by 6500/7600 platforms which act as CE/PE quite often.
So it is better to use VRF Selection using Policy Based Routing what is an extension of VRF Selection based on Source IP Address.
And I use it in production network.