I've worn these La Sportiva Synthesis Mid GTX hiking boots to DEATH, but they've taken me to some pretty spectacular places along the way.
Pros: When I tried them on, I texted @intothinair (who has the Men's version) and said "they feel like PILLOWS on my feet!" These boots are super lightweight, really comfortable and flexible. They are waterproof, yet breathable and they have pretty awesome traction - a must for me. The laces cinch up with ease, which makes getting theses babies on a piece of cake.
Cons: These boots are a bit TOO flexible at the base, and I find that I roll my ankle more often when wearing them - especially if I'm carrying any weight. I really have worn the crap out of these, but at the same time I don't feel like they are as sturdy or durable as they should be, and those easy cinch-up laces have already had to be replaced - which was a pain the butt... for @aarongerski.
Final Thoughts: I think La Sportiva is on the right track with this boot, but they need a little beefing up.