Yeah, all of my previous phones - going back to the Motorola StarTac - had it (all of my phones have been either Motorola, Samsung, or Blackberry). If you read the wiki article, I agree with the point that, IMO, it's an important feature so that you don't think you've been disconnected from the other person. Without it, I find myself either speaking much more loudly than I typically would a phone, and occasionally asking to make sure that the person I'm speaking to is still there and can hear me. It's somewhat frustrating - although it may be par for the course with an HTC phone (this being my first, I can't say).