I have a 2.33 that I use in clamshell all the time.
I run apps that max out everything, to the point where I use a second node computer. The fans will occasionally start screaming, and it is does heat up, but this is all in spec.
I ordered a part that can hopefully use my video card to output to two 23" displays, and if this works out, this laptop may be turned into a pseudo-desktop complemented by an MBA or NEW MBP.