... I have seen quite a few of the v rest heads come off while being packed up the mountain...
One nice thing about the Gen 3 and maybe earlier versions is that you can unscrew the v-rest head, revealing a screw that you can mount a spotting scope on. It is even more useful to me as an adjustable tripod for my point-and-shoot camera when I need to take "selfies" with a harvest.
If you get one, use a short length of thin paracord or similar to tie the v-rest head off to the handle so even if it unscrews itself you won't lose it.