[GuyBFF]

I've heard that if you place too much force on the head pipes of the Danners, it distorts the cover and they leak.

I've tried to do this (to test) and to this day I can't make mine leak, so I'm not sure what everyones talking about.

On the other hand I find all the O-ringed fittings on the eheim can dry up over time. Neither is entirely perfect. I do believe the Eheim is a better pump, but I don't see anything wrong with the Danner, and a lot of people start gooping and siliconing the Danner before even trying it (then rave about the need to do this, without ever seeing if theres actually leaked).