You just have to make sure that your company actually committed to paying you your salary minus the benefit, as opposed to committing to making sure you had the same take home pay. In the first case you should end up with about €500 (assuming higher tax band) more per month because of the tax free aspect of the benefit, but your employers would be equally entitled to reduce their payment to you by €500 and still ensure that you have the same take home, because you get the extra €500 from not paying tax on the benefit.
I'm actually surprised more employers aren't doing this, many of them probably haven't realised it yet!