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But judging from Market comments, Klipsch hasn't exactly been fastidious about making sure its app works on all Android phones properly. To purchase an S4A expecting this compatibility, and then to not receive it, would definitely be frustrating. As I said, it works for me on my BIONIC, but users of older or more obscure phones might have cause to be wary on this point.
The microphone on the S4A's works decently, though persons on the other end did comment about my seeming a bit "distant," not necessarily quiet, just a little more echo than usual.
Klipsch products have a reputation for their distinctive sound characteristics. Rather than being particularly flat or balanced, most Klipsch speakers are noted for having a particularly bright, resonating tone with deep and accurate bass. That's not to say the S4A's are inaccurate or lacking in fidelity, so much as they aren't what you'd call in-ear headphone"monitors." Klipsch definitely adds flourishes to your music that you would not otherwise hear, but those additions are usually quite enjoyable.
In particular, live tracks come alive on the S4A's, gaining brightness and depth that their recordings may not fully express on their own. Music with a lot of bass or complex low-frequency arrangements really shine on the S4A's, too, as you can really hear the bass notes underlying your favorite songs with clarity and deep, accurate resonance. If you want a good earbud for workout, dance, or any other headphone high-energy music, the S4A's are a truly superb choice.
For lower-key genres, the S4A's still sound great. While they may not have the fidelity or bring out all the subtle nuances of more expensive in-ear monitors, they add a character that makes for a unique and enjoyable listening experience you won't find anywhere else.