Vanilla is a product of Lussumo:
Documentation and Support.
I won't be replacing my collection for HD except in specific instances. But for new releases, the HD versions are almost certainly a more faithful reproduction of what was seen in the theatre, and on those grounds I'm likely to buy them.
JTraub: Yeah thats the key, for most films there is no point to forking over $30 for another version for HD
people complain about HD looking too sharp but I mostly think that is a result of them being not used to it