I've had a vargo Bot (titanium) for a few months and I thought I'd give my thoughts on it.
Light and well made. Does not leak when it's full of water. Needs a pot grab to be effective.
Sits well on a biolite stove. Bit wobbly on a Bushcooker. It's height makes it good standing in embers.
I boiled almost the full pot of water in 15mins in the embers.
I'm sure a wire bail handle could easily be knocked up for hanging ove a fire.
Very expensive for what it is but works well.