Content Experiments Features Not Available Or Missing
Multivariate Testing will not be available anymore. Google will rebuild this functionality at some point in the future (read this testing framework for more on the differences between A/B and multivariate testing).
E-commerce transactions as the goal will not be available
Maximum of 5 variations per test: this is a very big disadvantage and will limit tests significantly.
Maximum of 12 tests per profile at this time: another big disadvantage for companies doing many tests. Post Script: The Google Analytics team clarified that ”the maximum is 12 active/draft tests per profile. People can create more than 12 tests per profile over time, just not run them all at once.”
Implement the control snippet code once and leave it on the page for future tests. As of now, each test will have its own code.
For me the biggest disadvantage I see for 3rd and 4th points, I really hope that in future there will be some function to setup tests for more then 5 variations and hope that more then 12 tests option will be available, It's really important for me to be sure if this option will be available.
Please let me know if there will be alternative solution for this points, Is GWO will still be available as separate product for people who want to have more them 12 test per profile and create more them 5 variation tests.