This must be a speed improvement. My iMac was just a bit too slow and also the CD is just a bit bigger than the 24"
The 30" feels thicker than the iMac...and the iMac has it's guts behind it. I have my 30" sitting next to me waiting for my Mac Pro to come (tomorrow) and it's a pretty thick display, which is something I also noticed in the Apple Store.
Friggin heavy for a display too...I had to buy an extra leg to mount under the center of my desk to keep it from bowing under the pressure.
It'll definitely be a huge improvement though. I've had more trouble with my 24" C2D than I had with my original intel 20" CD iMac. This thing gets in fits where if one program hangs, it refuses to force quit and then goes on causing other programs to hang -- thus forcing me to do a hard restart. Extremely annoying. My 20" iMac was flawless, this 24" is just sexier. 20" had more HDD space also, this one is struggling with it's 320GB.
Here's to hoping our Pros are flawless. Cheers