Have had my Klipsch ProMedia 2.1s for awhile now and love them too. IMHO, the only significant flaw they have is that they are somewhat directional because of the horn-loaded dome tweeters. You get clear, accurate highs (some people use adjectives like "soaring" and "crystalline") at the expense of directionality. By "directionality" I mean if you sit too much off to the left or right from where the satellites are 'aimed,' you don't hear the highs as well. But keep in mind these are computer speakers -- they're designed to be put on your desktop, aimed at you as you sit in your chair and look at your monitor. They're not designed for people moving around the room. Aim them at where you're going to sit and you'll hear all the highs.
As others have said, the bass is punchy and tight rather than boomy or "thumpy." Wanna rattle the walls with exaggerated, muddy bass? Buy some other speaker set. Want
accurate bass frequency reproduction? The ProMedias do the job
really well.
One other thing that owners of these speakers often do is buy the admittedly-overpriced speaker wire upgrade kit from Monster Cable (last time I checked, Klipsch was selling it on their Web site). The better wires do tend to make a difference in most people's opinion. Whether or not they're worth another $30 or $40 (I forget the actual price) is up to you. I say get them if you can afford them.
People often compare the Swan m200s to the ProMedias, but the truth is that the Swanns' low frequency response does not extend anywhere near as low as the ProMedias do. And you can't expect them to -- the ProMedia 2.1s have a subwoofer whereas the Swann m200s do not. Pair the m200s with a subwoofer (at significant additional expense, of course), however, and that's a whole other story (and kinda unfair because of the discrepancy in price range that would result).
IMHO, the ProMedias paired with a <$30 Chaintech AV-710 sound card (with the good drivers from ViaArena) makes a great computer audio setup for listening to music. I don't know if I'd pay MSRP for them, but on sale, like I got mine, they're a very good value.
Here's a decent review of the ProMedia 2.1s if you're interested.
Just my $.02.