My #5 has not been used for a while, but my#7 has been used at Sluie a few times. great for firing a small fly across the river and wioth a light running line I can hold it off the surface to slow the swing much better than a single hander.
It will come into its own in about a months time when I will be swinging small flies or stripping Sunrays.
As Iaon says, no overhead casting, all spey. I have strung it uop with a #9 Outbound as Rio suggest in there chart for the rod (Helios) but I did not like it. I found that with a single handed rod two double hauls and the line was away whilst the switch rod need more effort.
So, for me, its a light line salmon rod or a heavy sea trout rod.
They do make fishing very relaxed and easy.