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I often recommend TrustRadius both to my clients as a way of backing up my guidance, as well as to other friends and clients who simply want to research options for whatever needs they may have. Given the vastness of the SAAS world, multitude of Mac/PC apps, and other web services, it's impossible for me to know everything (or for anybody to really…) to in those situations it's great to have TrustRadius out there as a destination to shed light on to various vendors' offerings.