User Review: La Sportiva Tibet GTX
I have had my La Sportiva boots for 6 years and hiked with them through the Himalayas, East Africa, Kokoda, Australia, Argentina and Antarctica. Great boot for carrying heavy packs, difficult terrain, ankle support and for comfort. Take some time to break in though so wouldn't recommend them for those thinking of back packing or trekking before wearing them in (3-12 months).
Have trekked 1000s of kms with these boots and with a little care they are very durable. My soles are starting to wear and the leather is cracking around my toes. Still waterproof and amazingly the Gore-tex lining is still in great condition.
Obviously it is important that you try as many boots as possible before deciding which best fit you. I found that these boots best fitted my broad flat feet when searching for a hiking boot and am hoping that they still have a few years left.