I have the Eliminator too, it is the best of the 3 I have owned. That being said, it collects dust, like Steve & Ed said. I might hit it a few times before the first trip to the track of a new season, but usually not.
I gotta say though, I have been using a trans brake whenever it's legal for several years now, which allows me to react to the flash of the bottom bulb with my heavy car, and I don't think a practice tree can improve your natural reactions much, if at all.
Different story when I was footbraking, for 25+ years I had to count bulbs to cut a .00x-.01x light. The practice tree was extremely valuable in "fine-tuning" the clock in my head back then.
So I would say if you are new to drag racing, or an anticipator / bulb counter, then yes, a practice tree can be useful. Otherwise, I think not so much.
Dan "Jim" Moore
Much too young to feel this damn old!!