I've heard of it. I have never seen any reviews. A while back I was shopping around for a similar device. I settled for the Weider Total Body Works 5000, which only cost $100 plus shipping.
I'm not sure if you have used similar devices. I can't tell you specifically about the BodyRail, but I can't tell you about my experience with the Total Body Works 5000. I believe that the two devices are similar enough.
I've had my Total Body Works 5000 for about 6 months. It gives an ok upper body workout, but does not provide even close to enough resistance for leg workouts. As I am sure you already know, these type of devices uses a percentage of your body weight for resistance. Some of them (including some BodyRail models), allow the addition of weight plates for additional resistance. Most of these devices allow up to 100 pounds of additional weight (I'm not sure of how much the BodyRail allows). But, once again, when exercising, only a fraction of this 100 pounds is lifted. For example, if at the maximum incline you are using 70% of your body weight, and you add 100 pounds of additional resistance, in reality you will be using 70 extra pounds, not 100.
Some similar devices use bands to provide resistance, and I know of only one (VigorFit), that provides both bands and the ability to add extra weight.
Some of these devices promise to deliver a cardio workout in addition to a resistance workout, in my experience the cardio workout provided by these devices is not intense enough to be effective. The way I do cardio on my TBW 5000 is by doing several squats while lying on the board. This cardio workout feels sort of like a stair climber, except that both legs go up and down at the same time, where in a stair climber they alternate.
After six months of use, I am retiring my Total Body Works 5000, I recently ordered a Proform Crossover elliptical/home gym combo. I am hoping to get a better cardio workout and more resistance than what I can get from the Total Body Works 5000.
Eraser