I bought one of the larger table models about 4 years ago, it can be positioned high or low because it has a flex area in 2 places and I am still on the original bulb. I use mine all the time, and when I'm not using it, hubby steals it to do jigsaw puzzles with. I do a lot of fine applique work at night and I can position it so it does not interfere with DH while he watches TV. I bought a replacement bulb to have on hand when one of the LQS's went out of business and it was 70% off, wish they had more at the time but if they last this long, I have enough to last me a lifetime.
BTW, I found that in a Big Lots store (Don't know if you have those where you are) they have lamps that are almost comparable at about 1/2 the price and they lave a bulb system like the Ott light. They run about $28-30.