PRIMER is fairly costly and I can understand why many would use ordination techniques (nMDS, PCA, CCA) in R (particularly the 'vegan' package). But I was wondering if there are any differences that I ought to be concerned about (e.g. will nMDS plots from the vegan package be starkly different from the ones we get in PRIMER?)? I obviously don't have PRIMER so I can't make a comparison of results and graphs, but what makes 'vegan' in R just as good as PRIMER?