So I'm tempted by the 15" rMBP in the refurb store. Since I was looking at the 15 with discreet, the video improvements from Haswell as not a really big deal. Don't care about battery either. Use it around the house only. So after reading a thousand threads, it seems that the main issues are image retention and lag. Image retention can be cured with a new LCD every sixth months or so it seems (Applecare is a yes on this one). The other issue of lag seems to be more a software issue rather than a hardware deficiency. Is this accurate? The only other issue I hate is heat. Not sure how this is, but I would have to check that after getting it as others will not be using it the way I would necessarily. So that's more subjective. I would also by the refurb in the next few days, so if something is earth shattering with the update, I could return the refurb. I am not a power user. Web surfing (a LOT of tabs), Aperture/iPhoto/Nik, Word, Excel and soon some basic video editing (gotta digitize those tapes I have been meaning to do for ten years now). So money is more important than say, a 5% or 10% gain here and there. So, in a nutshell, are those two issues the main drawback you 2012 rMBP owners have experienced? Thanks.