What do you like best?
If you are already using Adobe Analytics for your web site optimization tool then you should use Test and Target for your A/B testing. The significance calculation in the reporting UI is very nice and gives you a quick visual if the test reached significance.
You can have more than one test running at a time which is nice.
What do you dislike?
The pricing structure with Mbox calls kinda makes sense but is different than other platforms like Opitmizely. The reporting and setup of the campaigns needs to be improved, especially when it comes to setting up the KPIs for a given campaign. The fact that you have to create a segment first and then apply that segment to a given KPI, vs just assigning what you want in the KPI is still confusing to me and confusing to most people. There should be an out of the box integration already with T&T and Analytics and vice-versa
Recommendations to others considering the product
You need to have a dedicated team, not just part time folks, that are only focused on testing and optimization. You must have a marketing person, an analytics person, and most importantly a tech/dev person who knows how to write the html or js code to get the tests up and running correctly.
What business problems are you solving with the product? What benefits have you realized?
Basically its an optimization engine. Does experience A work better or B....don't know, test it real time with real people using Test and Target. It make marketers rely on data and not intuition.