The more I use it, the more I like it.

The good:

• Working with graphics is very easy
• Support for scalable graphics
• The source centric view is logical once you get used it
• The ability integrate Pro24.z into an rti project adds some nice options, especially for those who think the volume/channel controls on rti products are in the wrong place
• Tags and room macros make multi-room/shared source scenarios very simple

The bad:

• Roaming controllers(used in more than one room) are not really practically implementable right now
• Understanding how to use tags and macros properly takes some time
• You can convert ID9 templates into Apex but will take some work to get them all tagged properly and usable
• No recovery yet

At first I noticed mostly the things that were slower but now that I have spent more time with it I feel the good usually outweighs the bad.  I find it generally to be faster in apex.