Having read the other reviews for these speakers, I thought I'd give my opinion. I bought these to replace my Logitech R-10s because of their lack of clarity and bass response. What's the point in having compact speakers that don't sound good enough to make you want to listen to them?!
My first impression was that these X-140s are a bit bigger and a lot heavier and more substantial. They look and feel like they're built to last. They have two extra features too - a tone control for treble/bass balance, and an aux stereo minijack input on the front so you can connect an MP3 player without disconnecting them from your PC.
The X-140s are two-way as you can see through the metal grilles. The top tweeter cone takes care of high frequencies while the bottom cone takes care of the bass. Splitting things up like this gives much better clarity and bass response. The sound quality of these is sooooo much better than the R-10s without taking up much more desk space. The most impressive thing is the stereo imaging - these really create a realistic sound field if you sit in the middle.
Another major plus for me is that they come with a standard mains plug rather than one of those bulky transformer plugs like the R-10s which take up way too much room and usually stop you using the next-door sockets.
Some other reviewers have commented that these speakers don't go very loud. Well, I'm not sure that you can expect to use 2.5 watt desktop PC speakers for a house party. I want something that sounds really good without taking up too much space. If I wanted serious volume/bass I'd need something with a subwoofer, but then it takes up loads of space and irritates the neighbours! And these are only £15 which is a major bargain.
To summarise, I am really happy with these. They're well made, built to last, give excellent sound for their size/power, and look like they'll last for years. You have to give 5 stars for getting all this for £15.