Matthew G.wrote a review of Castelli RoS Shoe Cover on July 10, 2019
Familiarity: I've used it several times
I have about a 5 mile commute to work in San Francisco. This past winter (2018-2019) there would be stretches of days with rain. I had the Castelli Temesta shoe covers which worked great! Sadly the stitching ripped. I emailed Castelli to see if I could get replacements under warranty. They were really helpful and sent me a pair of these RoS Shoe Covers. I tried them out the next day as it was pouring all week.
About 10 minutes into the ride my toes were soaked. I have Sidi Dominators, which were also soaked in the toe. Sad to say that the RoS covers do not meet the same standard as Temesta. I guess newer isn't always better.