I am thinking of buying a refurbished/old stock/used/whatever ACD 24" but all the reports of the flickering issue have me worried. I have the MBP 13" 2011 (entry model with Intel HD graphics) I'd go with 27" but I think 27" is just to big. I have a rather old 22" LCD and I find it's size just about right. I think 24" is perfect size for me. Is the issue resolved with a firmware upgrade or should I expect flickering issues? Very lame from Apple that you have only 1 size of the latest ACD.