I have both generation 1&2. Generation 1 was upgraded to Gen 2...
Both have had problems, and needed to be sent back to Eco-tech...HOWEVER, customer service is awesome, and they were returned fixed and very quickly(a few days).
The noise that everyone talks about is a small humming, that you can hear if you are within inches of motor, or in a dead silent room(still very minimal) and only at top speeds. Noise seems to be loudest on the blue setting(I cant think of the name, maybe wave crest), I believe this is due to the motor speeding up and slowing down so quickly(this also makes the motor side much hotter, I'd say 20 degrees hotter, maybe more)
Flow rate and different wave settings are excellent.
Outside tank Motor is both great and annoying. Much less heat transfer b/c motor is out of tank, but a small bump might dislodge the 2 pieces, causing both to fall(which is a pain in the ass, and threat to corals)
OVERALL: I love them, they look the best of any pump, and have excellent capability, and flexability. I say buy it, but you should get the smaller version of vortech, b/c you tank is on the small side(this only applies if the smaller version has the wave maker/controller).