Plugged into a reader Transcend TS-RDF8K, speed is the rendezvous for pc on transfers! The writing speed is lower but the average of the other cards or even a bit faster! Minimal latency that does not slow the gusts and reliability "SanDisk" recognized for ages! I use as many CF cards as SDHC for many years and I have never been disappointed ... For me, the only truly recommendable cards remain SanDisk and Lexar which remain the best choice at this level! Is the price which is less competitive than other brands but the reliability and confidence have a price! To get better, you need to type in the pro range ... with the price that goes with it!