While options are good, I have had versa climbers at two of my past studios and they were the least used pieces in the gym. They are very compact, which is nice in a small space. But if no one uses it, it is just a waste of space. If space is the issue, go for it. I would advise you to show clients how to use it and encourage using it. Cost may also be a factor, but I am sure there are comprably priced alternatives like a stationary cycle. But treadmills are the most used pieces of cardio in any gym.