Actually, the prices are pretty substantially lower than tunze, aren't they?
A 2-way hydor controller and two controllable 4s comes in around $450. That's a whole heck of a lot less than a tunze 7095 multiconroller and two 6055s, which is more like $700. It's unclear to me whether the hydor 2-way controller is equivalent to the tunze multi-controller -- the Dr. Foster's description doesn't seem to indicate whether the hydors can be set to pulse while alternating, like the tunze multicontroller can do. But otherwise, they look pretty equivalent. The range and gph ratings on the hydor 4s are pretty close to the tunze 6055s. The tunzes, though, are much smaller dimension wise and also the tunze multicontroller has the moonlight feature, which is kind of cool.
If you wanted the hydor 4-way controller and four number 4 pumps, you'd spend about $750. For four tunze 6055s and the multicontroller, you're looking at over $1000 -- closer to $1100.
We'll need to see some reviews to see whether these are comparable products, but the savings on the hydors is certainly not negligible. It also seems to come with a wider range of controllable pumps. For example, in the small pump range, the tunze 6055 is the only game in town from 500 to 1500, whereas hydor seems to have several options (although this doesn't mean much since the tunze 6055 can be set to be anything you want in its gph range by changing the voltage). If you need a higher flow controllable pump, the tunze streams are still the only game in town. But for the up-to-100 gallon market, it seems way too early to discount this as a viable, less-expensive (though hardly cheap) option. And, for the record, I just bought a tunze 6055/7095 set up, so I'm hardly biased in saying the hydor seems like a potentially decent deal.