Can fit in tons of media, which means you can only put in half if the supplied media, not reduce flow that much and still have plenty of surface area to be very effective.
I have heard of this tap leak problem which as mentioned their very happy to replace... IMO and indeed experience external filters will always leak at one time or another o-rings are not permanent seals in any industry and water will always find a way 😡 I have run eheims and Fluvals for over ten years and found not one that seems infallible to this.