Co2 Reactor (of some kind?)

[Liquid-]

I just found this in a danish LFS where I live.

http://www.akvarieudstyr.dk/images/P...r/AM410040.GIF

It is a membrane-reactor (according to AquaMedic) in two models.
The 200 and 400 (up to 50gallons and 100gallons).
It works by connecting the co2 to the box which have a membrane where the co2 is released to the water. It has to sit in a place with alot of water movement, to spread the co2-in-riched water. They also say there will be almost no co2 loss.

At a price of only 34USD for the 400 model, I almost have to give it a try.
But first I just want to ask: Anyone have any experience with this kind of membrane reactors, and if so, can they confirm if it is only another cheap POS og really works?

Regards
Jonas

[Simon]

looks interesting, wonder how it works... if anyone tried it, update us please