Realistically, given that just about every MacBook Pro with a discrete GPU since the PowerPC-to-Intel switch (non-retina Mid 2012 15" aside) has had some form of issues (or an Apple Repair Extension Program) with the GPU, I'm wondering if, in the case of the Haswell-based 15" MacBook Pros, if it is simply safer to go with a model that only has Iris Pro or if there's any reason to suspect that the NVIDIA GeForce GT 750M and/or AMD Radeon R9 M370X will not have the kind of reliability issues that plagued said earlier models. I ask because I'm torn between two Apple Certified Refurb models; one with Iris Pro and the GT 750M and one with just Iris Pro. While I'm pretty sure that Iris Pro will be plenty sufficient for the limited gaming and video work that I'll be doing (especially given that most games aren't even Retina-native to begin with), the only reason I'm considering getting the model WITHOUT the GT 750M is concern for reliability (as logic board repairs are inconvenient, if not costly as well). Is there any data or information to suggest that 750M-laden retinas will have better reliability in this regard than 650M-laden retinas? Any insight would be helpful. Obviously, if there's no reason to doubt the reliability of the 750M retinas, then I might as well spend the extra couple hundred on the additional GPU horsepower.