Kathy,
I have a small portable Ott. I got it at a screaming sale at JoAnn's. I have to say that I don't use it as much as I thought I would, but then I don't have a dedicated sewing space, like many of you,either.
When I do use it, I love it! It takes away the glare, doesn't 'blind' you like regular lights do, and when I am piecing or using a rotary cutter, it is invaluable for keeping glare off my fabric and board.
Lisa