Got mine today, so far so good. Definitely crappy suction cups, I swapped my existing koralia powerheads onto them, then used the koralia magnets for the new coralife powerheads. The koralia's have already fallen off twice because i did a terrible job scrapping algae before i tried to suction them.
One thing I must say, is they are VERY quiet, I have mine ramping pretty aggressive right now while I play around with them and I can't hear if they're on or off. They also move lots of water, I have mine blasting against each other in the front of my tank, and every part of my tank has movement from them.
So far I'm impressed, and lifetime warranty, so much shouldn't change unless I have to use the warranty too often :P
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