I have a few suggestions though as someone that not only actively uses Google Docs but practically forces people I work with to do so too.
1. How do I make this appear in my existin Google Docs folder? I really do not want to have another place for my documents.
2. The pricing of Google Docs makes it really hard to beat. How does quip plan to fight that?
3. Still early days but people create different types of docs e.g Spreadsheets and slides for the same projects. How does it work with them without putting one type of doc in a differnt location from another? Especially when they are fr the same project?
4. My biggest issue when using Google Docs is that of formatting. The format does not play well with Word (we have to accept Word I'd boss for now and a monster number of people still use it ). Does the formatting work well with Word?
From my very limited knowledge, I have a few suggestions
1. Be the best at something and come inthrough the flanks. E.g the best way to edit your DropBox documents (I actually thought Dropbox would have launched a document processor by now). Coming through the flanks will remove the weight of expextation and at the same time allow people to
2. integrate you into an existing workflow for a large number of people. Eg. Sync with Google Doc.
3. Understandably, 17million is not a lot these days so you need to start earning money. But consider almost everyone will already have away of processing docs. I would find it hard to pay for something I have already paid to do. And does far much more work for me. You need people to start geting used to you and your pricing will limit adoption
The above is my feedback. I am sure you must have thought of it and more. I wish you all the best.