Did you tried it? Just to clarify, it's a Bioconductor package, so it works in R.

As explained on the manual page (http://compbio.mit.edu/cummeRbund/manual.html), it is "is designed to help orgainize and browse the output of a 'cuffdiff' differential expression analysis from Cufflinks".

My impression is that it provides visualisation tools to display differential expression (boxplot, dotplots and so on), rather than "plots of transcripts" (I assume you mean "transcripts displayed with pre-existing annotations", Genome-Browser-like... If you want to get plots similar to the ones on their manual page, then use it. If you want to get GenomeBrowser-like plots, then use something else, depending on what you're most comfortable with, or on what you wish to obtain...