$5 for a footlong is a darn good deal. Just note that the subs are much, much thinner than in the pictures, so I would suggest asking for double the meat, cheese, or whatever you want.
The toasted subs are my fave. (I'm not too fond of cold sandwiches.)
I like that they make it front of you. Half of the sub will fill you up, so the $5 foot long is actually good for two meals. The food isn't fabulous, but if you are budget conscious, you can get your money's worth here.
I don't have a favorite, but my boyfriend loves the Sweet Onion Chicken Teriyaki sub.
I've been here about 3 times and the customer service has been good every time.