I've got a Vimeo Pro account and it works as promised. Not as large of an audience there though.
Vimeo won't play 4k yet..only allow it to be downloaded..which is not what I want do. Being a dedicated Vimeo plus member for years, this makes me sad. I've contacted them, and 4K streaming is "in the works". Sad that you can get a video to actually look better on YouTube with 4K right now. I'm patiently waiting. My 1080 uploads look good, and I've always liked Vimeo's culture more.