Yes, Overleaf is awesome. I feel bad but I stopped paying for the Premium version with git-to-Dropbox syncing because the "stock" version is already so good. We put up a paper on biorXiv recently with Overleaf and two days later sent it off to a journal with minor reformatting. I only use Word for clinical collaborators these days, Overleaf is so, so good.

I still wish you'd support Markdown so that I could ditch Word completely. I hate that fucking program so much. I'd pay for Premium again just to use Markdown. :-)