oh did I forget to mention that?? the noise is gone! The flow is just so much more consistent, it's really pushing the water up, the overflow is strong, and the overflow control tubes have found a spot they like.. the system is now very quiet.. the only thing I can really hear is the pump, but in the cabinet, it's not too bad.. my 55g in the same room with a Fluval, and a biowheel hanging on the back is much noisier, especially when/if I let the water level get low.. the water level won't change with the jetstream system (any overflow for that matter)
This is my first experience with these jetstream models from Marineland (with any overflow system at all).. I thought I'd give it a try, and I have to say, although figuring out the right setup was a bit tedious, overall, the concept is very sound - and it's producing excellent current on the top and bottom of the tank..