I have one, depends on what you are planning on using it for. It's quite big for a day pack, but heaps of capacity for carrying meat. I have done a multi day with it, but won't again. The reason being once I got an animal, I couldn't set the weight up for a nice carry due to lack of room. In saying that they are capable of carrying a huge amount for their litre value with all the outside attachments.
Overall I would call it just ok, I don't have alot of experience with other stuff but I would imagine for the price you could find better. They come up on trademe pretty cheap though so could be worth seeing if they suit your needs that way.
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