In my opinion aluminum while being lighter than steel is much harder to work with. If you over bend a 90 you can't take the bend out. It just makes another bend in the pipe below the 90. The first time some one walks on your pipe rack, the pipe will bend making the job look like a hack installed it. Even when using thread lube, the threads often "gall" up at fittings. It is too smooth inside and makes wire pulling harder than in steel conduit. It costs too much. I would only use it when it is required because of corrosive issues in the area.
Don
