*Note that I am a young, advanced technology user (I work professionally in social media) and know my way around apps and word processors.
I have had numerous issues with Writer Duet. First, I like saving each draft locally as a PDF. This feature is available but when I hit save it takes between 30 seconds and two minutes for the save dialog box to pop up. Frequently hitting save causes the site to crash and freeze. I contacted support and they said they could not find a cause.
Writer Duet is also incredibly slow. I will often write a few lines and nothing shows up for several seconds. I spend a lot of time waiting on the site to catch up to my writing. It will also crash on me frequently, completely freezing, blanking the web page so it only shows the page's background color, and/or giving me a dialog box saying the site is not responding and do I want to wait or reload. I have lost the last several lines of what I just wrote many times. I usually remember exactly what I have written but when this happens on almost a daily basis, it really stems the writing flow. The longer my script or novel runs, the more issues I seem to have.
Customer support is friendly and is obviously trying to be helpful but I have never gotten a solution or workaround from them for my issues. It has also sometimes taken several days to get a response. I've tried their online help chat feature and even when it says someone is available it most often sends me to email.
I have had these issues across multiple computers, both PC and Mac and in multiple browsers including Chrome and Explorer.
Other more minor complaints include features that are labeled similarly and aren't intuitive to use. Navigation is also confusing. When using the app on your phone, there is no scroll button you can click with your thumb to scroll through pages quickly, you have to move the whole page up/down manually with your thumb over and over to scroll a fair distance. I don't like how WD opens different projects in multiple tabs, then opens documents within that project in identical looking tabs. You have to stay on top of what tab goes to what project and I am constantly closing unwanted tabs instead of just switching between projects.
I wish I had saved my money and gone with a different writing program. Review collected by and hosted on G2.com.