Had lunch there today, and at 50% off they probably have the most generous student offer ever.
Overall it was a good experience, most of the food was nice but not amazing.For example you can find better sushi, better noodles, better tempura etc. in other places, but it's great for convenience.
To be honest, I would definitely go there again for a cheap lunch as long as I can use my student card, but if I had to pay full price the total would be too high to justify the quality and quantity you get.