Ask HN: Any experience with AdMob?

Hello!

I've been quite successful selling premium Android apps, but I'd like to try my hand with AdMob. The problem is their website is extremely unfriendly and doesn't give any information about rates or CPM, and they won't pick up my phone calls. I can't even tell if you make money with impressions or click-through.

Has anybody here had any luck with AdMob, or are they a scam? If not, what kind of rates do you get?