I like this module. I like it even better than the RTF::Generator module which I wrote (which *cough* doesn't work well in current versions of Perl and is an incomplete implementation anyway).
The interface is clean and simple to work with. I was able to produce an RTF very quickly.
The only downside is that you need to know the RTF and work with the (sometimes nasty) RTF innards rather than an abstract document in general.