I'm on a student budget but I've be going for that deal of late. It's so cool, you can even mix and match.
I usually go for a mix of salmon, sea bass and lamb. There are two fillets of each.
I'm wondering if it's a reasonable deal or whether I should reduce my budget a little. I spend about £30 a week on food and wine, without taking my entertainment budget into account.
It depends whether you can afford it and how much you get for your money.
Personally, I wouldn't consider it as particularly 'good' value but I haven't tried enough of their meals to comment on the quality.
If you can afford it, go for it. There seems to be an unwarranted stigma around shopping at M&S as a student, I see nothing wrong with it myself.