Based on regular use of Vagrant and irregular use of Packer (to build base boxes for vagrant) I would be reluctant to rely on their other tools.

They mostly work, but it's never as seamless as they make it out to be.

I do appreciate the work that's put into these tools but I also believe anything can be criticised. That doesn't mean the author has to fix what everyone says is wrong but an attitude of "well it's free, either PR or stfu" doesn't help either.