1. User Intergration is seamless and we also integrate the css style
2. You would need to add links to the products in your VB
navbar not a hard thing to do.
3. Photopost includes option to place thumbnail and categories on the main VB
index. In future Reviewpost and Classifieds versions This would be supported.
Lastly, how do Reviews get "tied" to Classifieds, i.e. when users click on an image, do they see not only the ad but also reviews by other users about the ad ?
3 separate products most likely installed in separate databases or not installed at all so they are not designed to search results in tandem.