after owning tunze 6105 and getting wp40 i can say build quality is same or better.very impressive
altough rubbers on magnets are rather flimsy.
somehow its rather noisy when its set to any other program than constant speed.you can clearly hear it ramping up and down.however if powerhead is out from bracket its silent.so its vibrations from powerhead to glass that makes noise.
and i would say minimum size tank for wp40 is 4 ft.i have it in 3x2x2 and its a bit too strong.
flow is broad

its working perfect not so noisy :-)

Funciona muy bien y con poco ruido.Veremos lo que dura.

powerful pump makes a excellent standing wave even in my cube, other settings surge the water realistically, night mode and feed mode are great too noise settled down after 2 days, but wasnt bad to begin with. instructions are in chinese but its easy to figure out except where the night sensor goes but look closely at pics on here you will see it.

This one is realy a god product. Recommended :-)
It has a little noice, but at that price it does nothing. I love it.