Sorry, just saw this. Yes the SLVR as the gold version was just discontinued. Pretty much the same connector as the outer barrel is just silver plated instead of gold. I did not try the Duelund, but would be interesting. The Switchcraft is not as smooth, resolute or nuanced as the KLEI. The Switchcraft is a great value for sure and they sound very good and balanced. They are a tad nervous sounding compared to the KLEI however. This is a slight thing, but this quest for the best sound is about degrees. Ha!