The kit assembled (shown without cold plate).
The kit is simple enough to put together, although your third arm will come in handy when trying to keep the coldplate aligned with the jacket during assembly. I used a little thermal paste (not included) between cpu slug and coldplate, and between coldplate and water jacket.
The nylon bolt is smack in the middle of the socket in both directions, so even with a small-core cpu like a coppermine or socketA chip you should have no problems with the unit tipping to one side. I hand-tightened the bolt until I couldn't turn it any more - this makes the jacket VERY secure on top of the CPU - I was surprised that it didn't swivel in the mount at all under normal pressure.
For testing I inserted the block into my existing water-cooled system, replacing the existing "mystery jacket". This mystery jacket has as I mentioned before got the water inlet in the top-centre, over the core. I tested the DangerDen unit both with and without the included cold plate - there was no difference with this cpu, but with a smaller-core CPU you'd probably notice an advantage to using the coldplate. If you're using a peltier you should definitely use the coldplate between the peltier and CPU, so it's a nice inclusion by DangerDen. The rest of the system is pretty much as described in my original water-cooling article, with the addition of the modified Senfu single-fan radiator reviewed here. To give an idea of how water-cooling compares to air-cooling, I also tested the Globalwin FKP-32, reviewed here.
The PC is based around Asus's P3V4X motherboard and a Celeron 400MHz at 600MHz @ 2.3V in the Macase K10 midtower case reviewed here. Temperature measurements were taken both from the CPU's internal thermal diode and an external thermal probe mounted on the back of the slocket. The temperature was measured after an hour of looping the Unreal flyby intro sequence. Ambient temperature was 24C. The PC was allowed to cool and the water in the reservoir was replaced between runs.
You can see the DangerDen unit is beaten by a couple of degrees by the mystery jacket. I think this is because, as mentioned before, in the mystery jacket the cold water comes straight down onto the core of the CPU. Still, this is not a shameful performance from the DangerDen unit, as it roundly thrashes the FKP-32 - a well-respected air-cooler. I think the much easier mounting system of the DangerDen more than justifies the slightly lower efficiency than the mystery jacket and besides, I've no idea where you can buy the mystery jackets, hence the name!
The water-jacket is often the trickiest-to-find part of building a water-cooled system. If you've reached that point where you're looking to buy one, the DangerDen unit is well worth your consideration. Check out http://www.dangerden.com for a range of water-cooling goodies.