Concur with Thomas on the QSI opinion.?? I remove QSI decoders when I encounter one.?? I do DCC installs for others and I won't touch them.? Too problematic, time consuming, and fickle.??? I had one loco that came back to me 3 times, with the complaint that it wouldn't respond to commands on the individuals NCE layout, but when I placed it on my Digitrax layout ran like a champ.