I don’t have any experience with Classic Photographers, but it’s just as easy to find a photographer on your own as it is to choose from their small selection. It’s also sooo much easier to communicate directly with a photographer than through their service.
Hi Yachita! I don't know if it's the same company, but there is a Classic Photographers page here on WeddingWire with a thousand reviews, so my first suggestion would be to see if this vendor is the same one you're looking at.
I think Caytlyn and FutureMrsD offer some good advice as well. Photographer to client can be a lot easier communication wise and if you're interested in hiring someone who doesn't have a lot of reviews, you can always ask them for references or previous work.