Welp i got mine yesterday and to put it in short words, they're definately a step up from the Plantronics A90.
Sound is more detailed, clean rich bass but the high could use a notch in boost, but overall much less EQ tweak needed to my taste unlike the plantronics.
Don't get me wrong the plantronics hold their ground well but these just sound better imo.
One thing to note though the cord could use a boost in roughtness they're slim compared to the one that's used in the A90 even though i already had one A90 go south on me due to the cord itself.
Thanks for the deal, well worth the $30 spent, too bad its no longer active would've bought a 2nd pair for backup.