For the amount bass it packs, they aren't very boomy at all, they provide a very textured bass response for the amount bass they pack, i.e. the bass quantity vs texture/quality ratio is very high on these headphones, another reason they work so well for hardstyle that I listen to because this genre is using "textured" bass beats so to speak, inserts some mids / highs, a clean typical EDM beat gets distorted in one or another in order to give it a more exciting sound of some sort, it can be an nice "crunch", or blop, tok, pow, paw, whatever sound to go with the bass beat why I'm so satisfied with these headphones as they both bring the quantity and quality.
I wouldn't be suprised if you can't even find a bass-driven headphone with better quantity vs quality ratio even 3x as high cost. It's certainly not the "punchiest" bass I've heard (LP2, Sony XB800/900 especially) but comparing other bass boosted headphones it is definitely above "average" punchy. Their great subbass extension makes the bass seem less punchy so it's a good trade-off, midbass focused headphones can be punchier but this one brings you balanced midbass vs subbass output.