Got these for my Dad expecting them to be good but not as good as they are. The T40's have a nice clear, balanced and detailed sound compared to a lot of computer speakers. They are not as powerful as a set up with a sub, they are by no means feeble but what they lack in power, they make up with clarity and quality.
They are a 2.0 system so they lack the bottom end punch of a sub-woofer but you also don't have to deal with the frequency balance and hot spot issues a sub creates, with that said, they still have a decent low-end, just don't expect anything room shaking.
These the best consumer 2.0 PC speakers I have heard. I would happily recommend T40s to anyone and I am used to using studio monitors; while they wouldn't be suitable for monitoring purposes I would gladly use them to watch movies and listen to music.