I don't use on a regular basis, but every now and then based on photograph. ColorEfex Pro, Silver Efex and Output sharpener are the tools I use more frequently. Viveza, rarely. They have come a long way if you compare with the free versions. As for as PureRAW is concerned, I use DXO Elite and version 5 comes with it and a very good tool. If you have never used any of them, I'd say try them for free first and make your own mind, Honestly, you might enjoy the upgrades.
Only thing that I don't like about DXO is, their shady packaging of features into different tools and force you buy them. In my opinion, some of the features that are there in Nik 9 (depth mapping, color grading for example) should have been there as part of Photo Lab as part of RAW processing. If they can have it in NIk V9, they definitely can have in PL. That is just one example that I say, a shady bundling of features.