I've been running the WP-25 on my 40 gallon breeder for about a month and I am loving the wave action. More importantly, my corals are loving it- I am seeing better polyp extension. I am getting a 1" standing wave (seiche) over the entire tank. I did purchase a small voltage controller for LEDs ($3.50ish on eBay) to dial things in a bit better, but with the new controller and the settings I am using it was probably unnecessary. Hopefully the longevity of the unit makes it worthwhile. I figured the only way to find out is get one and give it a whirl (literally).
If I owned Tunze, I'd be peeved, but I am a poor civil servant and couldn't pass on the price.