I travelled with this ticket quite often a few years ago over pretty much the whole area of validity, though the price seems to have increased a bit - it was more like 15 Euros when I used it and this was only four or five years ago. I never used it on 'buses so can't comment, but the only problem I had was when I noticed that the validity had been extended to Roermond so decided to travel there. As we approached Roermond my ticket was checked and the guard informed me that it was not valid. I produced the leaflet with the line clearly shaded as valid, but she insisted that it was only valid for 'buses in the area. That's what her hand-held device told her. She asked me where I was travelling to - Roermond obviously as that was where the ticket was valid to. So she told me I would have to get off there which I was doing anyway. On return to the UK I contacted Netherlands railways who told me I was right, she was wrong, and gave me a apology, of sorts.
Anyway, it's a very useful ticket if you make the most of it.