Pubmatic-an ad network optimizer?

How to use it?
- Just visit PubMatic and sign up, it is FREE
- Select the Ad networks you want run
- Select the Ad slot size and instruct PubMatic if you want to auto optimize color
- Once all this is done, you have an option to generate PubMatic Ad tag, Click and generate the tag
- Copy this Tag and paste it on your web site/blog(It takes 90min for the PubMatic tag to go live)
It is apparently clear that PubMatic would provide
- Easy interface for publishers to place ad networks and auto optimizing ad networks for best delivery and increase revenue
- Mutually beneficial for the complete gamut of parties involved such as advertisers, publishers and ad network
- PubMatic accelerates the volume of publishers to their ad networks
If a publisher implements multiple optimized pub matic ad Tags at various slots on a single page(say example 728x90 and 300x250), will not the publisher see 728x90 Advert belonging to a different Ad network(example Google Adsense) and 300x250 of a different ad network(yahoo Publisher network) on the same page at a same time?
Problem is that, ad networks like Adsense, Yahoo, amazon does not allow publishers to place any other ad networks adverts except them.Publishers who violates, will have their subscriptions suspended.I am unsure if PubMatic has an intelligence system incorporated into PubMatic which ensures that different Adverts of different Ad networks is not displayed at the same time on a same page.
Currently, PubMatic is available for the First 100 publishers on a First come first serve basis.I got my subscription. I tried pubmatic its easy and kool. I have configured PubMatic to suit my Blog,and shortly would run Optimized PubMatic Adverts.