A couple of reasons:do explain...I'm curious.
sound quality was bad: background noise, mids and highs were mashed toghether, poor driver control, very little headroom
power: the 4 channel clipped at lower output than the 75 watt per channel polk or Jl slash series even though it was rated at 107 w per channel, audibly weaker than the two. The polk momo 500.1 was superior by far in driving my two kappa perfect subs, more output better damping etc.
construction: I took off the endcaps and I could harldly screw them back in, the threading was poor imo. The amp case felt flimsy.
cooling: fans were very loud, and they would turn on very quickly as the amp shortly started to get hot. without fans I figured they'd go in protection mode rather quickly.
I bought them brand new from Kicker when I worked at Circuitcity, not used, no lemons, no refurbised items.
