Although I might be a little biased...but I think UNC should definitely be one of the top programs in the Southeast, right up there with Duke, MCV, Emory, Vandy (to name a few) and not that far from Florida (in quality). Probably top 2nd tier or low-top tier (top tier = top 20 or so).
Excellent faculty. Chairman is well-known and very top quality. Other faculty are very good as well. Although the program is as small as one can get (4 total), the amount of research that goes on here is phenomenal for its size, so plenty of research opportunities at hand. Research is mainly clinical, with alot of good physics-translational research. More basic science or translational type opportunties are available, however. Excellent rad bio teaching. One of the big things the residents were emphasizing was that they are very much involved in every aspect of the treatment planning process, from start to finish. So resident feel very prepared coming out. Weakness at the time I interviewed was head and neck as they do not really have a head and neck "specialist," but are planning on hiring a new faculty member to address this issue.
Pro-resident atmosphere. If you like a non-malignant, laid-back environment, this is a place for you. The "pimping" that goes on there is done in a nice, conducive to learning way. Technology available here is excellent...on par with any of the big academic rad onc programs...another strength. Supposedly getting CT-on-rails soon. Residents seem very tight at work. Outside work, they don't really seem to hang out much together. Having said that though, they definitely seem to have lives outside work.
Will try to update my experience next year after I'm in the trenches...