The only thing that impresses me about LR is the bulk processing ability, I find ACR frustrating in that way. I have tried a trial version of LR some time ago and didn't feel the benefits were enough to change from ACR...that is spend a lot of money. However if I was a relatively new PS user, I would probably have CS4 and LR2. Adobe annoys me though with their product bundling, really LR2 should come with CS4 instead of ACR. Therefor for now I'll stick to CS3 and ACR, I'm happy with the quality of the results, even if it's a bit more labour intensive.