R is an example of the best and worst of FOSS.
Every time I switch institutions I can use it. No problem with lack of site license,no grant money for a license or activation problems on a new machine. I can use it on whatever OS the organization owns. I can get it up and running in about 5 minutes and it will work.
Awsome community. If you have a problem there's a good chance there's something in the CRAN that solves it.
But super steep learning curve. Begginner documentation is at best suboptimal ("go buy a book on S" is not the most helpful advice) The cost of entry to steep. It will take you a while to figure out how to import your flat text file for analysis.
The GUI's are hard to find and are limited in capability compared to something like SPSS. R commander is great but pretty limited and counter intuittive.
It's hard for me to recommend it to people to use for intro stats.
That said R I love and it's great to see it continue to thrive with a new milestone release.