Install is not difficult. These replaced an older set of pendant lights.  There was a nice assortment of extensions to get the height I needed. 
I actually used 2x12" extensions on one light and 2x12" and a 1x6" extension on the second light to have a staggered effect. It looks very nice and have been complimented on it by everyone.

Use LED light bulbs so you don't have to change the bulb very often. Changing the bulb is not the easiest.