Some others have mentioned this as well, but I have to HAVE to second what others are saying.
North Face has redesigned and complete messed up these pants.
I have a total of 6 pairs of these pants. My first 3 are virtually indestructable. They have held up to sliding across slickrock and busting through scrub oak and brush with no problems. So, the earlier reviews touting how great they are used to be correct.
However, I recently purchased 3 new pair of these when Backcountry had them on sale.
2 of them have had the zipper fail the first 2 or 3 times I wore them. And, I have had to have seams re-stitched on all 3 pair.
Also, it is painfully obvious that the material is inferior to the earlier models.

So, just because you have bought some in the past, do not assume you will get the same pair of pants if you order new ones.

This is the perfect headlamp if you need long battery life AND long distance lighting. It is definitely heavier than my other LED only headlamps I use for backpacking. However, I am a volunteer with Search and Rescue. When scanning a mountain side for a victim at night, LED's just don't cut it. This headlamp provides the perfect balance by allowing you to use LED's to extend the battery life while hiking. Then, switch to the Xenon for those times you need more light or distance. The construction seems to be reasonably durable. No issues or problems with it so far.
My only suggestion to the manufacturer would be to put the LED's and the Xenon on separate switches. There is only one switch that controls both and you have to cycle through the settings. If you are using LED's then turn it off, the next time you hit the switch the Xenon will come on. It is so bright it can effect your night vision if you are not careful.