I've only had the Dynamic volume feature on my 3808 for a couple of months but have noticed it has made watching TV a more pleasant experience. It appears to help keep the volume between commercials and shows on a more even level. I also really like Dynamic EQ, it helps with lower volume listening levels as it enhances the lower frequencies which almost disappear with low volume listening. Dialogue seems to be more intelligible with it as well.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70