I am using 2 monitors for over 20 years (since GeForce 2 MX, my first video card with 2 outputs) and I had no problems; at first it was 19" CRT, then dual 21",

I am using 2 monitors for over 20 years (since GeForce 2 MX, my first video card with 2 outputs) and I had no problems; at first it was 19" CRT, then dual 21", for the past 9 years dual 24". I had a colleague (now retired) that was using 6 21" monitors on a special stand in a 3x2 arrangement, he loved it. Different people have different preferences and tolerances.