Techniz.co.uk has posted a review of the Danger Den DD12V-D4 External Water Pump.

Overall, the DD12V-D4 water pump is a very powerful pump. The maximum flow rate of the DD12V-D4 is able to reach up to 1200L/h. I have tested this water pump by using the Zalman Reserator 1. The performance is very good as compare with the integrated pump. During the operation of this pump, it was very silent too. This DD12V-D4 from Danger Den is a medium size and very good external water pump for water cooling usage.

Danger Den DD12V-D4 External Water Pump Review