I hated the Kuhl pants and sent them back. Ideally, since a light pair of pants will keep you cool whether they're long or short in the summer, the idea of "convertible" pants doing anything seems to be marketing to me.
I am a skeptic, anyways.
When I got my Kuhl liberators, I liked the material but they were BAGGY, extremely baggy. They looked like they would get caught on everything, and I didn't even bother keeping them. I sent them back.
I picked up a pair of Mountain Hardwear Mesa Pants and have been thrilled. There isn't a ton of stretch (less than the Kuhl's) but the cut is loose in the thigh so you can climb over things. Thankfully, the cut in the calves is much thinner! They taper nicely without ever being fitted, but the fabric is out of the way from catching on your other boot or any briars along the trail.
These are my new adventure pants, and I am thrilled. Also, the pockets are fantastic- best I've ever used, all 5 of them.