Re: "Avoides temptation to overdo the bass"?
Presumably the reveiwer means the amp doesn't run out of steam at high volume, you know how most cruddy plastic speakers with dirt cheap op-amps tend to do. From the website, "An in-built digital amplifier provides a massive 15 WATTS of raw power", that pretty much confirms you're correct, plus according to the guy that makes them "There's also a built in clip limiter and compressor."
I've no idea what polycarbonite is though... maybe Han Solo knows ;)
@Jamie Kitson: Although it's supplied with a USB cable any 5V DC plug pack with a 2.1mm barrel plug can be used to charge it from mains.
Biting the hand that feeds IT
