Tony Bibbs writes about his painful upgrade from Zend Studio 5.1 to 5.5. While I'm a huge Zend fanboy, I noticed it looked a bit painful too and have stayed at 5.1 at both home and office. Tony's main complaint is with remote debugging and the Zend Server vs Zend Platform issue. I could never get the debugging to work in the first place. I'm gonna sit and wait some more on this one.