This app is very solid. The functionality that this extension provides requires a special installation method and the extension instructions make this complex process simple. Once installed, everything is very easy.

I think that the default behavior should be to reuse existing windows instead of creating new instances, though this can be configured in the browser settings within each web app.

For me this app is a must have. I have several fixed google documents per month that I open and edit very frequently every day. Having this plus a system launcher (like albert launcher) simplifies my work a lot.