As a  long time VE  Pro user, I was excited about the Multiport method and switched to it on both my slave PC and my Mac to work with Logic Pro 9. I even wrote an article about it for MacPro Video's Hub.

But I have returned to multiple instances because I became convinced that in the end having more instances gives me more flexibility to create alternative metaframes and better overall voice count performance.

On my slave PC, my present template has 7 separate instances from an SSD for EW's Hollywood Strings, Hollywood Brass & Hollywood Orchestral Woodwinds.

Similarly on my Mac, my present template has 6 separate instances for Kontakt based orchestral string, winds, brass, and percussion libraries. Everything else, synths, guitar, bass, piano libraries, etc. loads directly in Logic.

It works great.

Here is a few rules I have made doing days of tests

1) On a single computer, if you think in the future to go to MIR Pro, it is better to have the VEP server running one VEP

2) if you dont use MIR PRO it is better to have multiple VE PRO in the VEPRO server !

3) If you get in trouble(clicks, pops and hanging note) with the Multi port you can use IAC

4) If you have a slave and thinking to move to MIR PRO, it is better to use the fastest computer as a slave and put Logic on the slowest one

CC7 converter to CC11 is a good solution

Hope this help