I finally connected my MBP to my Dell U2711 and it looks really great especially at 2560 X 1440. This is with extended display. If I turn on mirroring, it lists the 2560 X 1440 resolution as available and selected but the display is clearly not at that resolution. With mirroring are you limited to what the MBP can do on it's display? That doesn't make much sense because Apply makes its own external display for this exact use. Unless they are all meant to be used as extended monitors. Heck, it's even nice having it extended but my intention was to use it with my MBP in "clamshell" mode and hook up my 10 point multitouch screen to my PC. Is the display really limited to the MBP's resolution in mirroring?