as homer would put it.... "focuser goes in, focuser goes out, focuser goes in, focuser goes out, focuser goes in, focuser goes out, focuser goes in, focuser goes out, focuser goes in, focuser goes out"
For imaging using an electric focuser is a god send, yeah you can touch the scope and make the scope bounce around until it settles only to find out its out slightly, so the process starts again, and sometimes again,but more often than not you want a steady image while focusing, thats where the EF comes in handy. Also for remote operation of scopes theres no better way than using some form of electronic device to help you out a bit. These devices arnt there to make your scope look like a borg, they are there to make things a little easier for people. I installed one on my scope cos I like pressing buttons. its all personal taste.