I just love this little guy! Stays well in tune, and has much better tuning than most of the other acoustic ukuleles I have used. Build quality seems good, it looks really cool (didn't you want to play AC/DC with a ukulele?), and it is sturdy.
This uses a passive piezo, so even though connecting it to an amplifier "just works", I believe a dynamic compressor is needed to reduce the output dynamic (sustain can be relatively low, while the click when fingerpicking can be high...). If they ever made a preamplified version, might be worth the investment.
Only thing I found weird is that the "tone" potentiometer actually lowers the volume too, which does not really make sense to me, and in general makes the tone control a little useless: you only have a brilliant tone, and you can tweak it with an equalizer in the amplifier.
Still this is a very good instrument for the price!