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I use it for some images where I like the look of the results better than ACR. For me it's about having a choice of ways to approach my RAW conversion - curiously enough I've quite often found that using DxO makes for colour images that make better B&W when converted (for my landscape work, where it appears to be related to handling of dark saturated colours and shadow)
ACR is still my default for general work, but every so often I have images that come out better in DxO. My workflow tends to be low quantities of conversions at a time.
There are a few more examples in the article.
One area that is not so good, is preparing images for stitching, where you need to deactivate quite a few of the best bits of DxO since they are based on analysis of local image content, and can seriously impact stitching quality