Bought these sunglasses last August and have used them HARD ever since. They have held up unbelievably well. Have used them for sea kayaking, sailing, hiking, driving, motorcycling...basically everything. They've been stepped on, dropped, bumped, etc, and the frames have remained 100% intact; the lens has one barely noticeable scratch. They are so light that I barely notice that I'm wearing them, yet they won't fall off. The polarized lenses improve vision, especially for driving and/or motorcycling.
The only thing I will warn of is that the reflex lenses will lose their shine in salt water. This is really no big deal, since they still work perfectly as lenses, but I would advise you to save those lenses for less intense occasions.