Only getting back to this thread now because the onboard free wifi was rubbish! But having done the whole journey that would be my only complaint.
It was brilliant. From the point of view of a family travelling to southern Spain it is a game changer and I hope it is very successful.
I think the whole no frills thing has been over egged by the company themselves. They advertise it with warnings as if it is a cattle ship, and before booking you have to accept a disclaimer that you are accepting steerage class. It is nothing of the sort.
The reality is if you are viewing the ferry trip as a necessary part of the journey as an alternative to driving through France this route wins hands down on every consideration.
There may be some less easily convinced because they view the ferry trip as part of the holiday itself and need clowns for the kids etc but for us this ferry is a godsend.