With this 5er the shower head works just fine but I do have the Oxygenic as a back up. We used it in a previous 5er. I always unscrew my shower head and put it in the sink and the hose goes back in the holder.
This question has been raised many times - search is your friends - and you will find an overwhelming majority of us have and recommend an Oxygenics Body Spa to replace the stock one.
X2 Probably about the #1 highest rated mod for a new rig. I've never heard anyone ever say it wasn't worth the money. It simulates higher water pressure while reducing water consumption... what's not to like.