pricegrabber also now lists reviews for the seller, not only the product. So, when you search for something, you can see how others rated the seller.
I’ve used pricegrabber many times, and never had a problem. They directed me to stores such as Amazon, Newegg, and other big-name stores. I’ve saved hundreds of dollars through them.
Example: Last year I bought a camcorder. B&H sold the model I wanted for about $225. I got it through pricegrabber for $140, from a very good online store.