Mine is currently 1yr, 8 months in the tank. Seems to be doing just fine. No problems whatsoever.
Update: Almost 2.5 years now. No issues at all.
Update - May, 2010: 3 years. No issues at all.
Update - April, 2011: 4 years. No issues at all.
__________________
400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436