As an Israeli, I can tell you that there is no friend or foe in the intelligence bussines.
It's like asking - is the MI6 a friend to the US, or not?
The truth is, that the MI6, KGB (in the times of the USSR), Mossad and NSA are just doing what's in their country's interest.
So the real question should be - is Israel a friend of the US, or a foe.
To that I can answer you without any doubt - the US is considered by all Israelis, from the far left to the far right, as Israel's best friend and ally.
Israeli culture is very influenced from American culture, the most popular movies in Israel are American, not European ones.
Hebrew picked alot of American english words, and virtually all Israelis know english (and American slang).
It goes so far into that, that many Israelis call Israel the 51th state of America

.
Ofcourse there is also some issues of disagreement, like the fact that America tells us what to do all the time, but it's more of a political issue then a cultural one.