Multisite and the cloud… Good practice?

So I am thinking I have a pretty sweet set up and wanted to ask the gurus out there if I had made any mistakes…

I have a cloud service that is running a mysql server, a image CDN, and two web servers… So three servers total and a CDN for the images…

My thought is that one web server i can use as my development server for testing themes and plugins with upgrades and then push the changes out to my production web server when I am happy that nothing breaks other stuff…

My question is when writers log in to make post and changes it does not matter if they are being routed through the production server because all that type of stuff (post, custom posts, pages, settings) sits in the database which would be shared by both servers and having all the images on the CDN that way the images are shared too and not on the web servers…

I know it would be very important not be logged in to both servers and make posts because it could have duplicate indexes but I think this will be fine because post would be made through the production server and I would be the only one with the IP to the dev server so I would know to never make pages or post…

Would this work? Or could I run into big problems that I would not know about… Cron jobs maybe? Not sure… I think this could be a good system… What do you guys think?

Thanks so much!!!