TrustRadius.com has hundreds of in-depth reviews of A/B testing software and several great tools to aid your evaluation.
In-depth Reviews You Can Filter — Reviewers respond to a series of questions to create their reviews. This leads to rich, high-quality insights. It also makes it easier for you to compare one person's perspective to another's. The quickest and easiest way to find valuable reviews that are relevant to you and your specific needs. Filter reviews to quickly find ones in your industry, as well as those from similarly sized companies. You can also filter by the reviewer's department and even role to find the reviews that are as close as possible to your own perspective.
Side-by-Side Comparisons — Quickly flip through the same portions of different reviews to evaluate and compare how each product stacks up on usability, integration, training and much more.