Summary: Amazing RAM. I've been using it in my recent power-build for about 2 months now, and the rapid task-switching speed provided by the 1866MHZ is better than anything I've had before. That said, the heat-spreaders add what I consider to be a very valuable aesthetic improvement over other memory. For quality memory with high performance and a sleek, powerful look, it's just the perfect option.
Summary: Plugged them in and booted up the computer with no problems. Went into the BIOS and enabled XMP profile because they were set to 1333 out of the box, rebooted computer and they were at 1866. Have had no issues. If using a large CPU cooler like the Dark Rock Pro 3, you will have clearance issues. Slot 1 is completely covered, slot 2 will work but you will have to raise the cooler fan to make it work.