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Pro Collaborative development support
Webflow allows workload to be shared among multiple users.
Pro W3C-compliant HTML5/CSS3
Webflow generates W3C-compliant markup and stylesheets.
Pro Responsive web design with Bootstrap
Because it's based on Bootstrap, it works across all modern browsers & devices.
Con Design tool is web-based, not a proper application.
The site doesn't state this explicitly.
Con Can't export your site for deployment unless you pay.
Not unreasonable, but something users should know before investing their time.
Con Fixed media queries
Webflow has four fixed breakpoints (desktop, laptop, mobile landscape & mobile portrait). The inability to set your own media queries can be limiting. If your layout breaks outside of these four options, you have to export the code and write them yourself.