I bought two of these, one for myself and one for my girlfriend. One of them was built fine and she's had no problems in 9 months or so so well worth the price. The other arrived with the 2 plastic halves not secured very well (small tab broken) and then it stopped charging after a couple of months; fortunately it was a straightforward soldering and sellotape job as i wasnt worrying about voiding the warranty..... But still, it's worked ever since (though i've lost it now) and i'd still say it was worth the price.
Anyway, time to order another one!
Charged a Nokia 5800, Nokia N86, Garmin SatNav and HTC Desire HD (with bluetooth, GPS, and data on, and using navigation and in-call) just fine, so fit for purpose it seems.