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Overall, the Speaker System Z520 is an innovative and well-designed set of computer speakers. ... However, like many compact speakers that attempt to produce full-range audio, the Z520's tonal balance has its flaws, especially at louder volumes.

You might expect better bass at high volumes for $130, but Logitech's no-frills Speaker System Z520 does make a good office speaker set, offering crisp output at moderate volume levels.

We'd have a much easier time recommending the Logitech Z520's average sound quality and lack of features if it didn't cost $130. We'd rather point you toward the Logitech Z523 system that offers best-in-class sound quality (and a subwoofer to boot) at an affordable price.

If you’re looking for a simple and compact pair of stereo speakers that still sound detailed, the Z520 set from Logitech is a good choice. It doesn’t have everything we’d want in a set of near-field speakers but the overall package is tempting.

Keep your expectations in line with this system’s price tag and you won’t go far wrong.

The speaker’s ability to present a stereo image almost anywhere in the room is what really impressed us; in fact, the soundstage didn’t begin to decay until we were standing at a nearly 90-degree angle to the speakers. Remarkable.

Despite their daring/innovative/surprising (cross out where not applicable) looks and very nice finish, these speakers just don't inspire enthusiasm and don't deliver quality sound.