What didn't work with your IIP? Did you sometimes get blank info?
If I recall your issue with IIP was the size of your post table. IIP was pretty inefficient for sites with larger post tables since so much information is pulled directly from the post table. That was a syndrome in PHP running out of execution time trying to grab stuff from a really large post table. Using the caching features will help, as will reducing the number of PAL boxes to the bare minimum, but I've had really large sites that were just too large for IIP to work successfully (on some server setups) due to the size of the post table.
