I have been evaluating Zend Studio 5 beta 2 for my many PHP related projects. It contains the things I like about the older versions, and also some of the things that I dislike. I like the features it contains. The auto suggest feature is nice, but sometimes it delays my typing as it is loading. Zend Studio, written in Java, can be quite a memory hog. Sometimes it causes the Java process to consume almost 200M RAM. I think that's a bit much for an IDE. Then oddly, it can drop down to only a few megabytes. Also, the file open dialog box is annoying. It keeps putting me in the My Documents directory, which is not where my web projects are located. Despite it's performance shortcomings, I will continue to use Zend Studio, while keeping an eye out for their new Eclipse based IDE.