IntensityLisa,
I agree with SteppingFool and DogOnyx, go with "The Original Health Club Step", the extra width is better. My Reebok step is 36" long and is a great workout but when I'd be at a club and use the 43" step it'd be just a little better! It can also go 2" lower than the Reebok. (4" minimum vs. 6" minimum) On the other hand, the Reebok can go to 10" (vs. 8") in height right out of the box with no additional riser purchases.
However like DogOnyx said, the Reebok step is EXTREMELY well made, I've had mine for 9 years now and it still looks (and works) as good as day one! I've noticed at the clubs with "The Step" the ribbed rubber across the top eventually comes unglued and starts to curl up making a tripping hazard. But keep in mind those at the club are used constantly, around the clock, not just for 1-2 hours per day.
Of course the decision is yours, based on your area and $$. (Just so you know, if do you decide on "The Step" for the extra length, be sure you order the "Original Health Club" one, not the "Studio Step Professional" because it is shorter - only 28" long)
I keep hoping my Reebok step will break, so I can get the longer one, but alas it is not to be. Hummm... "No honey I have absolutly NO idea how my Reebok step caught fire and melted!".... D*mn thing is probably fire proof too! ;-)
Nadine
~~Happiness is an Attitude~~