I use LR for several reasons: one is that it's a really great processing program, you only need PS to composite photos, do HDR or panos, or to erase a large segment of a photo. LR has wonderful data bank capabilities, allowing you great latitude in how you manage your files, as long as you do so from within LR. You can print very easily from LR, including creative printing pieces, such as multiple photos. You can export into any format and size you need. You can do slideshows (not the best at this), create a web site, and create a book (from Blurb) as needed. A good program that is used by both professional and non-professional photographers. Do purchase PS if you can, as the two really do go together. You can also easily use plug-ins in LR. Good luck.
Plus, you get 20 GB of online storage, which is a nice way to ensure the safety of your photos long term. LR5.2 can be downloaded now, it's been beta tested, but they are still making changes. They have added a few new things that might be nice.
I just read the information and this is the actual price, not an introductory offer. Sign up starting Sept. 17 until some point in Dec., not sure what happens after that. You must have at least PS3, just having LR won't work.