Hi,
I travelled to and from France with them last summer. Found them great; staff friendly, food/bar adequate, cabin clean. €600 saved on a 17 hour crossing that you will be asleep for 8 hours or ain't bad. Most of the other passengers were truck drivers, and I found that the lack of families/tourists made for a much quieter clamer trip that on the usual ferries - specifically no games rooms, noise, loud music, loud drunks etc. The ferry is smaller than the Irish Ferries cruisers and consequently the crossing rougher if the seas are bad.
As mentioned before though - do bring books/music players/toys as required. They do have a TV in the lounge, just wouldn't fancy your chances of getting anything but the footie on it!
N.