It's a bassy IEM, but it's not dark. BUT, if you're not used to dynamic bass and if you're not used to having that much of it, it can sound bloated and overbearing. My two cents: If you give yourself a little to adjust—and you're not the kind of person who hugely prefers a Zeus-style FR curve—you'll like it. There's plenty of top-end there, and it's lovely and detailed and (thank god) not fatiguing. It's just that the pure quantity of bass can be distracting from everything else if you're not accustomed to it. Worse comes to worst, you can always EQ down the the bass by a few dB and it should respond beautifully on account of the crossover network.