While it's a lot of work
While it's a lot of work to put down at first, if you're looking at freelancing as a career move, you're better off doing it like this. I would also make them pay for hosting, maintainence, and support.
For developers coming
For developers coming in from outside of Drupal, they'll probably notice a lot of familiar things from Symfony but it won't be a direct mapping. We have the Symfony EventDispatcher, for instance, but we're doing different things with it than Symfony fullstack, Silex, or Laravel are.
Finally ... SexyBookmarks for Drupal
I guess we all have waited for this one. Installation and settings no problem. However, not sure what to do with the block that gets created as it doesn't need to be 'activated'. I had an issue with the display of some bookmarks, as only a few have been shown. I could fix it myself and will report this issue to the support team. Altogether, having it up and running out-weighs the small issues.