Arch and I could no longer stand, having this on the shelf wondering how it worked, soooooooo christmas eve, we installed one on my 180 tank, commonly refered to as the "Dead Sea"

thats another story though.
After we installed and did some tweaking, it does in fact make a surging wave, from side to side. Really cool, it rises and drops about 1-1.25 inches from side to side. We were curious as to the effect of a overflow placed on one side of the tank, affecting its performance. If it does, its not enough to keep the wave effect from occuring.
Now, is it worth the money?? at 500 bux its steep, but again after Arch and I drank a few cups of coffee and pondered the thought, we decided yes. Why? becauseit would cost that much to create a wave or more, with 2-4 tunze turbel streams and controllers.
Bottom line...imo....if you are willing to drop this kind of money to create a wave effect in the tank, this device does a fantastic job at a fair price.
we will review this thread and keep you updated as the unit breaks in, also to answer any Q's you may have.