I tried this out when a friend purchased it. As a keen rower I have spent my fair share of time on a rowing machine, and this piece of equipment certainly doesn't even deserve the name 'Rower'. Even if you don't read on, take note of this point - This kit is not in any way like a rowing machine, nor will it provide you with a workout anywhere near as good. Do not waste your money on it.
Here are a few of the main issues I had with this kit.
Firstly the foot plates are not adjustable (as the are on for example the concept 2), nor are they fixed, so as you come towards the catch your feet flop down away from you. Not great. Secondly, and this is a major issue, it uses elastic bands as resistance... now the slight problem I foresaw here, is that elastic gets harder to stretch the further it is extended... therefore, on your leg drive (as you push back), the elastic is actually not that hard to pull, but once you get your legs fully straight and begin to bring in your back and arms, you might as well be lifting weights in the gym. Setting the bands to lower resistance doesn't help with this, because you fail to work your leg muscles even with all three bands engaged. Essentially, for rowing it is entirely pointless to use this machine, because you slam back with your legs against zero resistance, and then haul your arms back. At this point, I should make it clear that I am a fairly light girl, and even with all the bands engaged, the resistance was too little for me to feel it in my legs.
Thirdly, the elastic bands pull you back to the catch, so you will struggle to ensure that you have a slow recovery. While this could possibly be useful in making you aware of resisting a rushed movement, it can also just encourage you to be lazy and let yourself get dragged forward. This is even worse if you really try to spin your hands, as the sudden reduction in tension means that you get a jerk forward.
If you want to use this as a rowing machine, do not buy it. It will encourage the wrong technique, focuses upon the wrong muscle groups and is a waste of money.
If you want to work on your muscle tone, you would be better off going for a run and getting yourself some resistance bands to incorporate those into your workouts.