Clive a question I'm unable to answer at the moment, as I need to spend a little more time with the program. One thing I can tell you it's much faster and extremely cheap to buy. what I would suggest is that you download it as a trial.
Here are a couple of reviews.
http://www.digitalcamerareview.com/review/corel-aftershot-pro-review-a-worthy-competitor-to-adobe-lightroom/
http://www.pcworld.com/article/2304652/corel-aftershot-2-pro-review--photo-editor-a-formidable-competitor-to-adobe-lightroom.html