Yes but ...
One very important point missed in this article is that AoE brings the opportunity to segment mirrored storage across distance meaning its IDEAL for city wide failover. Used in conjunction with NexentaStor, you can build very cost-effective but feature-rich highly available (and DR ready) storage systems. One such example was demonstrated live at Nexenta's European Conference in Amsterdam last month where in front of a live audience, a 12TB NexentaStor volume was failed over from one data centre in Brussels to another 15km away; total solution was in the order of EUR 50,000.
Coraid's stuff is simplicity in itself and no lie that it takes minutes (if not seconds) to set-up. Network aggregation is also superb, adding further connections between Coraid Unit and server adds instant bandwidth, just like turning a tap higher, flow throughput increases immediately. No multi-pathing issues either, just does what it says on the tin!