I've been using an Optivisor for detail work for over a decade now. I literally couldn't build anymore without it. IMine's not lighted but if I ever felt the need, I guess I could duck-tape a couple penlights to the thing.
I can't imagine trying to use one of desktop thingies and having to wrestle everything I work on under that.
One warning about the Optivisor (or similar): It takes some getting used to. You might have trouble focusing, or resolving the two images in your brain, or even get dizzy a little at first. But stick with it and your brain and eyes will learn how to handle it and before you know it you'll be putting it on and making the transisitions instantly and unconsciously.