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Well, it doesn't seem particularly slow to me, but otherwise my impressions are pretty much the same as yours, Ethel. To be fair though, I understand that Google were obliged to release it earlier than they intended, due to the accidental leak of the details onto the net.
Technically, it sounds like a good idea, but I think we will have to wait and see what evolves. The absence of an ad blocker means I certainly wouldn't use it at the moment, and the fact that Google's revenue comes from advertising would seem to indicate that an effective one may be a long time coming! I