I previously owned the "first generation" of unibody MacBook Pro when it was released back in 2008. I purchased 24-inch Apple LED Cinema Display with it. The two worked fine together and have enjoyed the combination. With i5 processor upgrade, I thought it was worth the investment to upgrade to the new MacBook Pro. Now there seems to be some issues that users should be concerned or at least be aware about, especially if you were to attached an external monitor. The integrated GPU on the new MacBook Pro is Intel HD Graphics, which is suppose to run under low profile situations or when running under battery to maximize the battery usage. As the information gathered on the internet, Apple adopted an automatic switching between the two GPUs, Intel HD and NVIDIA 330M it ships with, without logging on and off and interrupting your workflow or you even knowing about it. Switching of the GPUs without logging off is great, but since it's automatic, there's no way of running it strictly on integrated GPU. You can choose to run it strictly on discrete GPU, but not the other way around. The new integrated GPU is not powerful enough, or it just chooses not to, to run attached display. When the LED Cinema Display or any other external display is connected, even under a low power consumption situation, it will run under discrete GPU full time. Doesn't matter if all I'm doing is just some web browsing with Safari or running the Mail or iCal, it will run under the new discrete GPU. This generates the new MacBook Pro to have excessive heat, cooling fan inside to run faster, creating a loud fan noise. This happens when I'm doing just basic work. I do use Final Cut Pro, DVD Studio Pro, Photoshop once in awhile, but not everyday. Discrete GPU worked great, I just changed the setting in the preference and reboot or re-logged to run more powerful applications. (This with my old MacBook Pro) Now, even if I wanted to run under integrated GPU with the LED Cinema Display attached, I can't do that. It might not be an issue to many, since discrete GPU is suppose to perform better. And it does. When rendering some videos or running powerful applications, i5 processor is much faster than the old Core 2 Duo. And since you'll be attached to the power adapter, it has nothing to do with your battery usage. I liked the integrated GPU I had with the previous generation that I owned, since it was quiet and didn't create much heat. Everyday work with the integrated GPU was more than enough. I created a case with Genius Bar expert/agent, and have an option to return it or exchange for a different machine. I'm debating now since I like the new i5 processor (again, it does perform better than Core 2 Duo), but don't like the GPUs. Maybe an iMac + lower-end MacBook Pro/Air combination might be an option for me. Just my two cents.