Gx based on existing PHP MVC framework?

Splitting from the main Gx thread. Seemed like a big subject unto  
itself...

When the thought of using an existing framework was tossed out a few  
weeks back, I wondered how seriously is this option being considered.  
If thoughts on this subject have already been discussed in IRC or in  
the thread, I may have missed them, sorry.

Could folks share their thoughts on this subject here?

Seems like making the choice to use a framework could free up  
developer cycles and provide more focus on Gx feature development. On  
the other hand, the Gallery framework is pretty damned powerful,  
tested, and known by the team. Thoughts? What are your attachments/
interests in using Gallery 2, existing PHP Frameworks, or something  
else as a foundation?

Here's what I've read/heard recently about about CodeIgniter and Zend  
Framework.

CodeIgniter seems to now be known as providing significantly better  
performance than the rest of the frameworks. This is in part due to  
Rasmus' recent talk on PHP Frameworks.  Other than performance, I  
don't know much else about the merits of CodeIgniter.

http://www.sitepoint.com/blogs/2008/08/29/rasmus-lerdorf-php-frameworks-think-again/

I've worked a bit with the Zend Framework in recent months. It's been  
dinged for increasingly poor performance in recent releases. The next  
major release promises to focus heavily on performance improvements.  
Their roadmap states that v2.0 will heavily leverage improvements in  
PHP 5.3. ZF has support for unit testing (to some degree), dojo  
integration (should be able to substitute YUI or other), a nice ACL  
component, and Zend_Tool promises to offer all sorts of command line  
tooling capabilities.

Seems to me that ZF has really increased project momentum over the  
past year. Their partnership with Adobe to simplify interactions  
between Flex and ZF apps might be of some interest when discussing RIA  
interfaces/features in Gx like drag and drop, etc.

All of this is fine and well, but ZF 2.0 won't be released until well  
into next year.

http://phpimpact.wordpress.com/2008/09/16/zend-framework-controller-22-drop-in-responsiveness/
http://www.phpjack.com/content/zendframe-works-future (see Matthew's  
Clarification comment)
http://blogs.adobe.com/flex/archives/2008/09/adobe_and_zend_announce_collab.html

Thoughts?

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