I, too, purchased 4x1.5 TB drives and I'm very very disappointed they don't work properly with the DNS-343. I'm glad I didn't take the plunge back in October when this topic was started - it's been more than a month! I feel bad for people STILL waiting for that firmware update - but I guess my wait has just begun.
Hurry up, before this $900 purchase turns into a $900 return! Cmon, D-Link!