I have experienced both sides. I am guilty of slow response to my for sale or trades ads. This was due to work calling me out of town, after posting items for sale. I had no control over my employer's request, when I really needed the extra cash for extra-curricular activities. It was extremely frustrating, and most buyers were understanding. On the other hand, there have been some buyers that were responded to quickly, and said they wanted the item, only to never hear from them again.