I have a rMBP. It works fine, no noticeable image retention, despite using LG. However, its frame rate sucks on OSX when scrolling PDFs, Google Chrome and so on. It is abysmal when zooming in and out through image apps like Pixelmator (scrolling is fine, thankfully).
Windows 8 is smoother, but Windows has other problems with regards to HiPPI displays. You can scale the display just like in Retina OSX, but fewer desktop applications are designed for scaling (so they'll just look blurred), others look cut-off (large buttons in small containers), and it's incompatible with multi-monitor setup (text scaled 150% on the laptop will be scaled 150% on secondary normal monitors, making them useless, and it's probably a lost cause because of design).
On the other hand, the mediocre 1440x900 resolution of cMBP is not attractive either. I already have 1280x800 (the same of 13" cMBP) on my entry-level MacBook; a Pro is supposed to have more.
Windows 8 is smoother, but Windows has other problems with regards to HiPPI displays. You can scale the display just like in Retina OSX, but fewer desktop applications are designed for scaling (so they'll just look blurred), others look cut-off (large buttons in small containers), and it's incompatible with multi-monitor setup (text scaled 150% on the laptop will be scaled 150% on secondary normal monitors, making them useless, and it's probably a lost cause because of design).
On the other hand, the mediocre 1440x900 resolution of cMBP is not attractive either. I already have 1280x800 (the same of 13" cMBP) on my entry-level MacBook; a Pro is supposed to have more.