Back in late 2015, Consumer Reports released it’s first round of Convertible Car Seat Ratings based on it’s newer crash testing protocol. We published an article about their testing and ratings at the time: https://carseatblog.com/36420/
Since then, they have added and updated a few models in their ratings. The latest Britax ClickTight convertible models, Boulevard, Advocate and Marathon, now top their list in overall score and receive a “BEST” crash protection rating. Some models like the Nuna Rava and Graco Extend2Fit were not tested in the original report. Both have since been tested and receive “BETTER” crash protection ratings. Also, updated versions of the Britax “G4.1” models have improved their crash protection ratings from “BASIC” to “BETTER”, they are now called the Britax Emblem and Allegiance.
For subscribers, the updated ratings can be found here: https://www.consumerreports.org/products/convertible-car-seat/ratings-overview/
We also discuss their latest round of testing for combination harness/booster car seats here: https://carseatblog.com/47321/