Ok so there are plenty of great reviews of this place already but I'm going to throw mine into the mix as well.
The food here is fantastic, but if you've ever walked in there around lunch time you could probably figure that out from the crowd. Everytime I come in I try a new one and I'm always happy with it, I've yet to come across a pasty I didn't like here.
When it comes out you might not think it's that much - but portions are deceiving because the food's pretty heavy. My main tip to you is only eat half and then pause to let it sink in - take a break to drink your beer or something. I always force myself to save the second half and it makes me much less sleepy when I head back to work after lunch :) Plus it makes great leftovers.