Not sticky on mobo side, same as my Asus stock one, it has a gel/silicon gasket stuck to its own side to stop damage to the rear of mobo, it looks exactly like my Asus one in size but obv height is different for mounting heatsink.
Artic Freezers are good but only 90mm until 120mm extreme version arrives with 6 heatpipes, I have ram a customers PC with same CPU as mines with 90mm freezer and my PC idles and loads lower temps than his, fan is also near silent at full speed where as freezer one gets loud, I swapped fan as it too quiet and used the mobo to control a faster fan depending on temps