John I'm sold. I just ordered one to try. I took all the batteries out of my tmcc engines. Then I discovered the missing sound thing with my challenger. I'm looking forward to trying this. Thanks
Yep, if you have a TMCC/Legacy locomotive that drops sound occasionally, this is a good option. I have a few that do that. OTOH, I have many command locomotives that I've never had a sound drop issue with, and I don't bother with batteries for those.
Obviously, for conventional users, the YLB is a good option as you'll eliminate the jumps when you change directions, etc.