Even though many of the Vagrant-purists and PHP-haters mock it, I am very happy that PuPHPet exists. It is hands-down the best way to show "I only do LAMP" developers what their world can be. And I appreciate any mechanism that is a gateway to something better - Linux got more users from distro-on-a-cd than "how to compile a kernel" books;-)
Hi! I have received almost no negative feedback from Vagrant users. I'm in #vagrant all the time, and mitchellh has been very positive about the project!
I can honestly say there are few more welcoming communities than the Vagrant one :)