For me, the huge downside of emacs is the not-very-fast single-threaded virtual machine with dynamic scope and one huge global namespace. It does an incredible number of cool things, some of them you can't find anywhere else, but I always end up bailing for an editor where I can reliably type and have characters show up instantly.
I actually (honestly) haven't heard of them. Are they your programming idols? Are they beyond reproach? Do you worship them and snark at anyone who criticizes there ideas?