I have 3 brushes that are all similar to that one (I bought one the other 2 were gifts). I also have a few friends that different brushes that are also very similar. Although they are not the exact same but VERY similar... seems as though just the shape is different, they do now work any better than any other comb, brush etc...
The blades (or prongs or whatever they are called) are all very close together on the deshedding brushes/combs that I have & it looks like that one is the same too... even on a well groomed dog it is hard to groom them with blades that close together.

I personally don't really like them. They don't seem to make that much of a difference at all & it takes longer to brush them.