How easy is it to switch my usage to google from s3? Right now i have a rails app that uses carrierwave to manage images and store them on s3. All i needed to

How easy is it to switch my usage to google from s3? Right now i have a rails app that uses carrierwave to manage images and store them on s3. All i needed to get s3 set up was two lines of config, a ruby gem, setting some heroku config variables to the api keys. How easy is it to switch?