Air resistance machines can be pretty water-realistic, hence why Concept 2 rowers are so popular if you're spending big money. But if you're not spending big money and you don't actually row, then I doubt it really matters massively which type you get.
I row at uni and train on Concept 2 machines but fancied something do keep me going in the holidays, so bought the one you've linked. Basically, for my needs it was awful. I'm not massive and although the slide is a normal length, the actual chain system is too short to allow you to finish a stroke properly. Equally, it's not big enough at the other end to let you get forward properly and your stroke length it limited by the fan housing. The foot plates are also attached too low and aren't adjustable. Christ knows how they expect you to row properly on them, as it's not possible. The air resistance system isn't brilliant on it and is in no way "speed proportional", as the fan slows massively between each stroke, so it's almost like starting from scratch every time you pull. On top of that, the quality wasn't brilliant - I managed to snap the plastic housing at the front and the entire machine front section flexes upwards when you take a stroke. Although flattering, the distance indicators are hopelessly inaccurate in comparison to a Concept 2 (which I'm taking to be more accurate), which would lead me to assume that the calorie indicator would also be pretty random too, if you'd be bothered by that.
That's a bit damning and I'm sure it would be fine for gentle to moderate exercise. However, if you actually plan on using it a bit harder or actually want to row with some technique, then don't bother, as it won't allow you to. I'm not sure if the quality issues are shared by more expensive V-Fit rowers, but I'd be more inclined to go with this one if you can stretch to it ...
here. Googling for rowing machines also brings up some reebok and york ones around that price area. Try and find some user reviews before you settle on one.