Open Stack

Hi fellow stackers,

I would like to hear your opinion and experience of using Cloud Foundry 
in front of OpenStack. I'm evaluating open source hybrid cloud 
management options, an CF raises mixed feelings while I read about it. 
Any opinion about the following subjects?

1. CF web page tells to use Essex. Is it Grizzly compatible, or is the 
info accurate?

2. Does the open development model work in the project, is vmware open 
enough to take in patches?

3. Is there active community of openstack developers/users taking part 
to CF to keep up with OS development?

4. Any other opinions and experience you think I (anyone) should be 
aware of it?

Thanks for any hands on experience,

Ilkka Tengvall // Cybercom