I've used both Bose X and Zulu.. and I feel the Zulu has better bass... had a much deeper tones as opposed to the Bose X, not to mention Bluetooth and an aux input (that cuts out when the radio receives signals) that you can plug your ipod into. If you're flying in busy airspace all the time then you really don't want to use those features, but if you're in the country side VFR without flight following or flying at night when there's reduced traffic, having music is rather nice, better than the monotonous sound of the engine(s) droning you out. I wish the Zulu headset came in a darker color (like dark gray) but I can paint it when I purchase mine.. plus it's cheaper than Bose.