The CrystalDiskMark results attached to this review relate to the 64GB cards I received in June 2020. As you can see they performed respectfully in a short test at least, easily suggesting that their V30 rating for dashcams, drones etc should be attainable although their random read / write speeds for smaller files is lower than my current average. Performance wise these cards are comparible to a number of brands in this price range and competition is fierce which is why I have only given 4 stars - for the same price MyMemory own branded cards have slightly faster write speeds and a better random I/O performance with a lifetime warranty. These cards are probably best suited for applications that involve larger files where fast write speeds are important (such as dashcams) followed by moderate to regular use (such as in a phone storing music and photos) but not so much for applications or holding an OS (eg Raspberry Pi) where the random transfer characteristics may disappoint. It is too soon to tell how reliable they are and my use-case for these cards will be very light duty and not in a dashcam.
In other news the cards look quite distinctive so if you fancy something different or want to be able to easily differentiate between your cards these are worth considering.