Anybody buy a headphone amp for your sansa?

SanDisk MP3 players Sansa® Fuze™
10

DX has an interesting looking headphone amp for $8.50 shipped.  According to the specs the total harmonic distortion is .05%, signal to noise > 90dB.  That’s not bad for $8.50.  Uses a single AAA battery for 20 hours of playback time.  Brand is FiiO E3.  Never heard of it, for what that’s worth.

http://www.fiio.com.cn/en/showproduct.asp?id=301