I can still hear people speaking, if they're near me. I'm still so relaxed, I think I'll never take these off. Ambient - maybe it means surrounding noise? I can hear a car honk, or somebody yell, or a dog bark. I don't get the constant hum-thrum-thrum of the world. It seems to cut the noise level about in half. Like I said, not perfect, but waaaay better than nothing. Wish I'd done this a long time ago.
Years ago, I walked out on a dyke into the Bay of Fundy - I was about 2 miles out, and I could still hear the sound of traffic on Main Street in Wolfville, a town about a mile long, cars spaced about 5 minutes apart. I thought, where on earth would I hear silence? Maybe the Bose headphones do that completely. In the meantime, I'm glad for the relief from the others.