I certainly agree the two examples I used are rare (even though I wanted some self powered M&Ks at one time) and your analogy is good. No conflict at all. The benefits of balanced vs unbalanced debate has consumed a lot of energy and I don't want to heat up that discussion. I can see the marketing angle for a particularly feature but I wonder what came first; the consumers buying products with balanced outputs and the manufacturers responding or the manufacturers pushing them?