Danger Den uses better equiptment. It also uses 1/2 ID (for a higher flowrate) The Bigwater pump pushes liquid at 105gh while the Mag pump from Danger Den is 150gh.
The Bigwater, however, does give you the equivalent of 3 120mm rads (a single and a dual) where the DD kit only offers a single 120mm rad. The DD kit is totally internalized whereas the Big water will have you with a dual 120 rad sitting outside your case.
It can be a question of how you are about watercooling. What you will find, if you think you will stay with it, is that DIY (do it yourself) is the way you will eventually go as your cooling solution expands and changes. In this scenario, the DD kit is more beneficial (because of it's superior quality). Danger Den is universally respected as producing quality watercooling products and are interchangeable with most any other brand of 1/2 ID cooling products. But, the Bigwater kit will probably cool better for you now. Better cooling immediately then it's Bigwater, future proofing for upgradeability then it's the DD kit.
You should check on ebay as the Bigwater kit is, by far, the most frequently auctioned kit of any. You might could get it cheaper there.
How ironic is this. I just bought the DD Maze4 Power Kit, just like the one mentioned above, and I gotta say that I'm not too impressed with the quality of the package. Everything was individually wrapped and nothing was broken, but the water block for the CPU is tarnished on the sides (I know that doesn't really matter) and there are two pieces of tape covering the contact side which do not meet in the middle, leaving about a 1/8th inch strip of tarnish on the bottom of the block. Plus, the inside (which you can plainly see through the acrylic top) looks like it's full of crud, but that may be more tarnish on the inside of the block. The surface of the block isn't even lapped, which quite frankly I was suprised to find out.
Also, the kit supplies you with one tiny bottle of coolant (about 6oz I think, it doesn't say) and that's not even enough to fill the resevoir--it would have been nice if the kit either included enough fluid or stated that you will need to buy additional fluid on the outside of the box.
The radiator is painted black but some of the paint is chipped off of several fins (a small detail, but would preclude mounting anywhere visible on a custom rig) and there is no CPU block mounting plate for the back of the motherboard where as the DVD clearly shows one.
And speaking of the DVD, it's nice and all to be shown how to install a water cooling kit, but first of all, it shows a different kit being installed, and second, I'm lucky I have multiple ways to watch DVDs besides the computer I'm about to tear down to parade rest to install the kit.
--All that having been said--
I've heard too many great things about DD to be totally dissuaded from buying from them again so I'm going to return this kit for another and see how it looks. I read a review in MaxPC (I think) that compared a DD kit and a Gigabyte kit, and the worst thing they had to say about the Gigabyte kit was that the hose clamps were inadequate which resulted in leeks. So that right there is enough for me to steer clear of Gigabyte kits.
Just my thoughts, mind you.
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