Very easy to use and great for building a portfolio of work, you can personalize your page with the video positioning and categorize them into folders which helps future clients find videos easier. I particularly like the simplicity of sharing the video with clients via private links rather than file sharing.

I can't find many negatives for Vimeo, and overall my experience has been a positive one. The only thing that comes to mind is that repositioning the videos can take a while when you're doing it in bulk. We had to unpin each video individually, we tried to google a quicker/easier option but couldn't find anything; that's not to say it could be a user error.