So far I am very pleased with the update to Lollipop. I tested the issues I have had on my S5 and my alarm goes off when the phone is muted! YAY! Everything seems very snappy. I did not do a cache reset or phone reset. No problems so far. I am curious to see if my WiFi connection becomes more persistent bouncing between my house and work (sometimes it would tell me put the WiFi password in again). Texting and other tasks are quick and very responsive. Happy so far, but updates to come with any potential issues or problems. All positive thoughts from me so far though.