Coming back to the subject, I want to say that I find the Viveza 'plug-in' (external editor) bad value. Nikon Capture NX2 for about the same amount of money will give you the same control point functionality plus much more (like powerful RGB editing, masking etc etc).
So for someone not using PS, getting Nikon Capture NX2 even just for using it as a TIFF external editor to LR is, I believe, much better value than just getting the Viveza thingy. If one happens to be a Nikon NEF shooter also then this argument becomes of course much much stronger.