Western Digital has seen a future market demand and filled that void brilliantly. The new Red series offers outstanding throughput, dead-silent operation, and even some enterprise features at a cost only slightly above that of the lowest cost consumer drives out there. The ability to continuously and dynamically self balance is a feature unseen in even their own enterprise lines, and is a sure contributor to the 1 Million MTBF rating. I see the Red becoming the defacto standard for all bulk storage array applications. Given the recent push towards the home NAS concept, I think a bunch of folks are going to start seeing Red everywhere (in a good way).
Read the article, which includes benchmark comparisons between the red drive
and other WD drives, at PC Perspective.