I have been using LR 3 for several years. I'm thinking it is time to upgrade to LR 6, but I'd like to be convinced that this is a good idea before pulling the trigger. I am pretty familiar with 3, but I am definitely out of the loop with regard to the subsequent updates. So, please tell me what useful features LR 6 has vs. LR 3. (I've done some online searching, but I'd like some Photo Forum folks to indicate what, specifically, they like in the newer versions) Thanks!