Since I upgraded from a VP100 to a VP160 last week, my normally dormant brain awoke & began considering a surround speaker upgrade using the Trade Up feature here.
I called Axiom to see if I could use my present QS4s plus my now unused VP100 to acquire some QS8s. But alas, only the QS4s were eligible for trade in - sniff!
For me the price differential between the 4s & 8s just wasn't worth the small performance gain. So now my pristine VP100 sits abandoned but safely stored in my garage...