If anyone wants to try Zend Optimizer+ I threw together a control panel for it, which it was missing compared to APC:

https://gist.github.com/ck-on/4959032

I've found Optimizer+ has a few shortcomings, like no way to delete individual files from the cache, it's an all or nothing reset if you turn off file stat.

However it's definitely a bit faster than APC, at least 10% in most cases because of its multiple optimization passes.