I've only come across hash once. It must have been really really good shit, because a grams lasted me a week and a half. It tasted purely amazing, smelled the same, and gave an amazing body high. We just packed like a quarter bowl of KB at a time, and broke up the hash and sprinkled it on.
That's the only time I've ever had hash, but I can't imagine the majority of hash being anywhere near that strong, because a lot more people would smoke hash then.