I purchased 4 of these. 3 of them flicker at a reasonable rate, but the 4th flickers slowly and is less realistic. Generally the bulbs flicker with a colour which is slightly more orange than a normal flame.
Update after 1 year of owning these bulbb I got a blown light switch. Can't be 100% sure if the bulb is at fault or not. I replaced the switch and so time will tell.