iStock is extremely easy to use, and I like being able to pop in and find a photo for a marketing need that we don't already have an in-house photo for. I also like the feature that suggests photos that are similar to the one you're looking at. Review collected by and hosted on G2.com.
It's limited as far as being able to organize and save folders of photos for future use or see what photos you've recently viewed. It's kind of like starting from scratch every time, which you may not want. Review collected by and hosted on G2.com.
