I've had these for over 2 years now and they've served me well. Initially I was worried that they would completely block out external sounds (being earbuds) but that didn't turn out to be the case. Having said that they do a great job of blocking out most external noise.
The bass tones comes out nice and deep. It's no different to listening to my desktop subwoofer. The overall sounds (mids and highs) are also included.
My only gripe is that these earphones don't come with a carry case. Over the last couple of years they've been through rough and tumble in my bag and now the right- arphone isn't working anymore. I would buy this model again if it weren't for its successor being present - Creative EP-830 In Ear Headphones
If you've never tried these before I recommend getting them.