I haven't had any problems, and I even have a hand-installed Ruby 1.9.2 on the system level. (rvm plays well with this: "rvm system").
I haven't noticed any clashes even in this case. By default your rvm is installed for just one user. So if you're all that worried I'd create a different user to try out rvm, and just install rvm on that user. Then if it fucks up you can nuke that user.
If you want to play with MacRuby and keep a more standard Ruby that you already have installed, rvm may be a good choice.
I haven't noticed any clashes even in this case. By default your rvm is installed for just one user. So if you're all that worried I'd create a different user to try out rvm, and just install rvm on that user. Then if it fucks up you can nuke that user.
If you want to play with MacRuby and keep a more standard Ruby that you already have installed, rvm may be a good choice.