I think it depends on WHY you are going as to how good it is. We went before DD was born and thought it was great - lots of relevant info for first time parents-to-be and got to see a lot of products in one spot without having to trek to a million stores all over the bloomin' state! There were a couple of Big Brand baby stores with decent stalls so you could buy all the normal things but at a better price (but know your prices before you get there if you know what you want). There are people who try the "Hard Sell" tactic on you and it can be overwhelming so feel free to "take a break" and come back to the stall if you think you want the product.
The second year we went, we were looking for things for the 10 - 12 month age bracket and didn't see much that was a decent price. Although I DID buy a jolly jumper! A lot of the info was also irrelevant. We didn't enjoy it as much and found it a PITA with the pram.

We didn't get many freebies either year and the ones we did see were really aimed at newborns.

If you go, have a great time and schedule in a rest time because you will need to sit and regroup - it can be full on!

MG