Without the 'pops & burbles' this exhaust sounds discernible better than stock.. Stealthy and resounding, without being too overly raspy.
Plus it eliminates those big, saggy, exhaust cojones.
Kudos to Akrapovic for their research and development, as I'm sure with the new OPF requirement, they couldn't just re-label the old M4 barrels but instead had to go back to drawing board and design a revised, compatible product - so I kind of understand the high price tag.
As always, keep us updated on any changes..