2nd (well, 2nd, 3rd & 4th? - I have 3) for the SpeedWave DC2640. I have 1 for my return, 1 closed loop, and a third utility (frag tank, water change/separation tank, zeovit reactor, calcium reactor).

crazy quiet, no vibrations, all around good fun.

Diablo, SpeedWave, Waveline, even the Jebao one just coming out -- I don't think you can go wrong!

other than the premature failures sound like nice pumps