This was installed 1 year ago by a "professional" contractor. I can't comment on the degree of difficulty for installation. We chose this type as my husband is 6'6" and we needed a high track above so he wouldn't have duck getting in. It is beautiful. A bit difficult cleaning between the panes that overlap. Does get scum build up, particularly at the base which is not so easy to clean. We had a leak in our shower base so the entire unit had to be removed and replaced with no problem. Also, our apt is old so the walls are not quite exact so the doors don't quite meet the wall - also be interested to see how others have connected it to the wall - my contractor used A LOT of clear silicone sealant to fix these to the wall which is unsightly - I need a new contractor obviously, not shower doors!!!  Glides smoothly and silently and doors are heavy glass - would definitely recommend.