Recently got a G-sync monitor for my gaming PC which allowed me to hook up 2 x LG 34UC97 screens to my Mac Pro. Have to admit it is a little overwhelming (excuse cable clutter):
Late 2015 iMac 27" 5K
3.3ghz i5
16GB Ram
512GB Flash Drive
R9 M390 GPU
Just arrived this morning, sold my early 2015 rMBP as needed more power and pixels