I have never physically seen one but by the looks of pictures they are the size of a standard polini or bzm waterpump. The water is already cool going into the waterpump so it will not make much of a difference even if it did have a positive effect.
My suggestion is not to waste you money as on these small bikes, better water flow is more important.
Both the standard and racing BZM waterpumps flow quite a bit more coolant than the Polini ones. The Polini water pumps have proven, in most cases, to be adequate enough. Unless you're in the market for a new water pump, don't bother.
Water pumps are funny things, especially when you're talking about crank speeds in excess of 12k. When driven too fast, the impellor will cause cavitation, a phenomenon where a bubble of air forms around the impellor, when no water is pumped at all. The key is to have good efficiency at all speeds without the risk of cavitation. The phenomenon is less likely to occur at higher pressures so it is not uncommon to see pressurised systems working at twice or three times the pressures of normal cooling systems.
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