I think some of you have seen these by now, but I figured I'd go ahead and post them for everyone. I am waiting on mfgr comments to finish the reviews; Joe said he'd post them on Sunday when he got back in town from work. Anyway here are the results for the Dangerden Maze4 and the Swiftech MCW5000-A:
Earlier Swiftech results were using older springs (presumably weaker). With the newest springs the MCW5000-A looks pretty good at lower flow rates (such as you'd see with multiple blocks or that 3/8" tubing that Swiftech likes). Their strategy for cooling system design makes a lot more sense to me now.
The Maze4 is less restrictive than most of the other waterblocks and does reasonably well at high flow rates. I wouldn't recommend it with anything less than a Mag3/MCP600 though and I wouldn't use it in a loop where multiple blocks are lowering flow rate below 2GPM.