I have used DxO since the first version, which I saw at Photo Expo years ago. I used it sporadically for quite a while, but never a lot, though I kept it updated. With the past couple version, Photolab2 and Photolab3, it's really come into it's own. LR is still better at recovering highlights, but DxO is much better with noise and sharpening. Now that you can use the DCP profiles (the same as LR), color is much better for my Canon cameras.
I still prefer aspects of LR workflow better (and of course, printing), but have grown to really like DxO on it's own. I like that there is no need to import! You work right from your folder of images. Too damn many DAMs out there!