Again, bears repeating. Actual decibel between SL and regular levo is the same. The SL is at a higher frequency and that bothers some people more - and from the looks of it bothers most people more. For me personally, I found the regular levo to be noisier and don't notice the SL as much. I happen to be a serious amateur musician so maybe the SL sounds like music to me. LOL
And I've passed multiple people by on climbs ( including the earlier anecdote I posted above ) and nobody seems to notice that it's an e-bike. Maybe the sound of my breathing is heavier.