I was going thru this exact same dilemma. I have the FL and needed a full length step for my newfound love of Cathe step w/os. Although I totally understand the ultimate versatility of getting the Step Co. step w/ the risers which would also work with the high step, I decided on the Reebok step. Then I was searching for the best deal, right? For the Step Co. one, Walmart has the best price but only has the turquoise & pink risers. I bought my Reebok step at performbetter.com, which currently has them on sale for about $69 and with shipping to California, the total was $75 something (shipping was $7.50, which was the CHEAPEST shipping I found on any of the online stores). I ordered online on a Tues. and received it the next Monday via UPS ground. It also had a step VHS w/o, which I haven't looked at yet. fitness1st.com is a great site, b/c on one page, it has the club step co. step, the high step and the Reebok step, so you can check them all out on the same site. For the Cathe w/os that need the high step, I plan on using the FL, which worked fine for my FP w/os too.
Anyway, I LOVE my Reebok step - it is really heavy and very solid feeling. It makes Cathe's step stuff so much more fun!
HTH Belle