I've eaten from Shiraaz about 10 times. They're worth coming back for. All the usual suspects are on the menu. I can vouch for the old standby, butter chicken. The tikka masala goes down pretty well also.
The atmosphere inside is really pleasant. It can get a little crowded inside and the waiting staff can be a little over-attentive, but perhaps you are not quite as fussy and particular as I.
I prefer to buy and run. The best takeaway option is the family pack, which is a bargain at 49 bucks and includes three main dishes, two sides, rice, naan, raita, pappadums and chutney. Good value, better taste.