Outback is a very nice and popular restaurant for celebrations. It is an Australian based cuisine…read morefocus in meat, nice, by the way, but overpriced in my humble opinion. I've been to the branches in the US, Brazil and even celebrated my birthday once in one in the outskirts of London.
I recommend the experience and even more, recommend that you keep an eye for their promotions and take advantage of them to go visit during these times. You can either get free appetisers or even the famous knife or cups they use at the restaurant.
Have fun there but my suggestion is that there are restaurants that are way better in terms of cost benefit out there.