Anecdotally, two of my sons have W8 and no complaints. I haven't even been asked for help
One bought it bundled with a laptop. The other upgraded his notebook based on his brother's experience. They like it and they've had nothing but a positive experience - for what anecdotes are worth.
I'm inching closer to giving it a try but it hasn't infiltrated my work world. However, I'm beginning to get that "Oh no! I better get up-to-speed" feeling