Danger Den Koosah waterblock

Ihave been looking for waterblock's for both my 7950 GT's, and i came across these,

now my question, are these blocks any good. I cant seem to find any review on them and that is what worries me. any help would be much appreciated.

PS:these are the ones http://www.arcticmod.com/computer-mod/danger-den-koosah-sli-candy-video-water-block-uv-blue-orange-nvidia-7800-7900-7950-series.htm look sweet don't they