I have the 2013 Retina MacBook Pro with the 750M dGPU. The thing is. Prior to this I had a 2011 Macbook Pro that I used with a 23" 1080p monitor and eventually a Thunderbolt display. I used it like this for about 3 months before the dGPU failed. Since getting this computer I have used it with just the built in display. It is beautiful and vivd, but I miss my old clamshell (sometimes dual screen) setup. The thing is, I am very nervous about running the dGPU all the time. I realize that the 2011 models had a design flaw, but I'm still cautious. I wish this was the Iris Pro only machine for peace of mind, but aw well. So: Do you use your Retina MB dGPU all the time? Do you think it would hurt? I know it shouldn't hurt, but Apple has a bad history.