I have been looking at upgrading from Chemcad 6.3 to either Chemcad 6.5 or the latest Aspen Plus. I am happy with Chemcad 6.5 but I was wondering 3 things

1. Has anyone got feedback on the Chemcad 6.5, 64-bit installer - does it give demonstrable benefits over 32-bit when used on a 64-bit windows 8 install?
2. Are there any other real life benefits of Chemcad 6.5 over 6.3?
3. If I am looking to switch to Aspen, is the extra component database that Aspen has worth the learning curve changing to a new simulator?

Thanks for any feedback.