I've got a few different watches and believe not one watch can do it all. I've had a Suunto Vector for over 10 years and take it every time i go bush. i used to wear it in daily life but got sick of looking like i was just about to jump out of a plane! they are big. I've also got a Tissot T-Touch with ABC (alitmeter, barometer, temp) but only use it for fun and car based photography trips and wouldnt want to bash it. I think my Suunto needs a new battery o-ring as it is starting to condensate on really hot and sweaty days.
The way i use it is when i know the height of a summit or way point (look on map before start) it tells me how far i have to go when visual is not clear- ie trees etc. Really helpful and no need to stop or open pack etc.
I also like it for temps in the morning- though the temp will not work on your wrist.
If youve never used one before- be prepared to recalibrate the altilmeter, as they work on air pressure and this changes as the weather changes- no fault or even limitation just the way it works. I just check it each morning against a map of known height when in the bush.
The one thing the Core has that would be nice is the sunrise/set times. For those interested in a very big watch and the heavenly movement check out the YES watch
http://www.yeswatch.com/ Love theidea of knowing how much light is left, moonrise etc.
Who doesnt love gadgets?? Though as some have mentioned most smartphones can do alot of these functions as well.
robert