Wayne Seguin and Michal Papis' rvm has several useful features for ruby developers which include managing multiple versions of ruby and controlling gem visibility on a per folder/project basis. The latter of these two features is also entirely handled by bundler in a significantly better manner. Bundler completely supplants the functionality of rvm's gemsets, leaving rvm to handle its primary purpose: easily switching between Ruby versions.
Sharing a global gemset shared between all projects using the same ruby version means that instead of installing a gem once per project, all projects using Ruby 1.9 can share the same gem. This can make a pretty big difference when you have many projects, develop gems, or use gems that are costly to reinstall (e.g. capybara-webkit).
Legacy projects without bundler will still need gemsets, and jumping around between projects that don't use bundler will probably still prove the value of rvm's gemsets, but when starting a new project using bundler, there is no need to use a gemset.
See also:
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