I'm not the best person to comment on the Nikon P-520. One of my problems is that I don't take pictures very often, and I frequently forget just which buttons to push and which menus to open. But I can offer the following, for what little it's worth.
It's an amazing piece of equipment. The list of features is way too long to list. You can set it so you can point it at your dog, and the shutter will fire when the dog looks toward the camera. (Useful for zoo animals, too.) You can set it so that, in portrait mode, it will fire when the subject smiles. (My wife and I tried that. It really does work.) You can set it so it will take several shots in quick succession - and pick the best of them.
My biggest complaints are the ones I've already mentioned: the EVF and screen just aren't as good as an optical viewfinder, and the shutter lag just about rules out taking pictures of moving objects. I suspect the manufacturers will solve the latter problem pretty soon.
I've got one other beef, which a lot of folks make about a lot of cameras these days: the owner's manual stinks. In the box you get a printed booklet that shows you the most basic operations (how to turn it on, how to put the battery in, etc.) in English, French, and Spanish. You also get a CD that contains the full manual - in your choice of language. If you think to yourself "oh, I'll just print out a hardcopy," you're in for a shock: your printer will spit out a stack of paper about an inch and a half thick, and twice as heavy as the camera is.
The solution: look the manual up on line. I figured "Great! Anywhere I have my cell phone, I'll have my camera manual." This is indeed an acceptable solution. But looking something up in the manual isn't as easy as it sounds. The thing is divided into two parts - each with its own sequence of page numbers. Looking up something usually takes me about five minutes. Too long.
I found a firm online that prints copies of camera manuals, and I got one for the P-520. It's ok, but the thing is still awfully cumbersome. And the index is pretty weak.
That being said, the Nikon Coolpix P'520 is a wonderful camera otherwise. If you use it a lot, the manual probably won't bother you.
I paid a visit to our local photo store yesterday and picked up a valuable tidbit of information. I have a four-year-old Canon superzoom point-and-shoot sitting around, and I asked how much I could get for it if I traded it in. His answer was, "about $45.00." It cost about $250.00. He explained that bridge camera models get updated so often that they start depreciating almost immediately. Moral: if you have access to a reputable used equipment dealer, this is a great time to get a bargain on a used bridge camera.