Product review (4 stars): a bit tall, but performs well.
A bit taller than other filters I've used, so it doesn't quite fit right in my humidifier.

Update: After running my humidifier for two weeks with this wick, it has dramatically outperformed a lot of the other options I've tried.  I've had to turn my humidifier to a lower setting to keep it from emptying the tank within a day, and shows no sign of slowing down yet like so many others I've tried that slowed to half or less performance in that period.  In fact, at two weeks it is outperforming others when they are brand new.