The HK is worth it.
I'm not much of an audiophile but the sound from my audio set up (Alpine Amplifier MRV450, Kenwood KDC-X959 head unit, Infinity 6000 comps front, JBL GTO 6 1/2 3-way rear, Alpine Type S 12" Sub) in my RSX is comparable though the sound in my RSX is much clearer at higher volume due to the amp.
My 1st BMW-bought: Munich 2013 F30 335i, RWD, Alpine White, Black Leather, M-Sport Line/Pkg, Dynamic Handling Pkg (Adaptive M Susp, Var Sport Steering), Prem Pkg, Tech Pkg, 403M (Bridgestone Potenza S001 RFT 225/40/R19 255/35/R19), Sport auto w/paddle shifters, Heated front seats, Harman Kardon, Aluminum Hexagon Trim w/matte Estoril Blue accent
Std: Xenon Adaptive Headlights, Sunroof, Alarm
Mods: Dealer tint, DIY lower intake grill guard, ASS recoded
Hergestellt in Deutschland