I think DCC has made sound so much fun with model trains. I remember the days when people would sell Tape cassets of Diesel/steam sounds to play under the layout LOL. Now we play with sounds that emit from the loco running on the layout. Its very cool. Smoke. ....I dont own any locos that smoke...yet....The old tyco smoke unit is BS. However I think the BLI/MTH puffing smoke is very cool when putting on a show for guests. I like the slow speed puffs like when you are pulling a train out of a station at 10mph , passing under a bridge and picking up speed... it looks pretty cool. Its not something to be used all the time. its just one of those things that you use when "showing off".