Mike O wrote a review of Suunto Core Altimeter Watch on December 19, 2012
Familiarity: I've put it through the wringer
Starting with the Observer then getting the T3 then ending up with the CORE, all I can say is wow. It has the functions of the Observer but with the weight of the T3. I went with the Alu for added protection against rock. I highly recommend this watch for your daily and outdoor lifestyles!