nice block there, b8ng8! Shore is purdy!
Maskedgeek, your block has the same, ahem, 'problem'. Mind you, I'm not saying it's a bad design- it looks like it will perform very very well, certainly better than the Cooling Solutions block. I'm just looking at it from an outside perspective, thinking about how I would've done it. I would've cut out the center island completely, or cut slashes or teeth or something into it to give it more surface area at least. Why?
Well, it stands to reason that the part of the block that receives the majority of the CPU's heat is the part directly above the copre, right? Why make that area just a sold lump with water flowing only past it's outer surface- you could leave it empty with a thick base, or drill it into fins, or form it into a
screw or something to to increase surface area and thus, hopefully, cooling power.
Also, the Cooling Solution block is smooth aluminum, with nothing to induce turbulence or guide water flow. Water will more likely go directly from inlet to outlet, without going around the central pole(hottest part) at all. Look at it:
So, I think it probably isn't a very good block compared to others I have seen. Then again, even a not-so-good waterblock usually performs extremely well! So take my nit pickings with a grain of salt.