I just created a thread on this last week. I own the P3 4K, as well as the P3 Advanced. Without a doubt, I love my P3 4K just as much as my P3 Advanced. People say the P3 4K is basically a P3 Standard with a 4K camera. This couldn't be further from the truth. With the P3 4K, you get VPS, a better transmitter, a better camera, and slightly better range (I've easily hit 1400m w/ a bone stock transmitter). I only paid $599 for mine back in July. In my opinion, it's the most underrated P3 in the lineup. Yes, Lightbridge is far superior to Wifi (I'm blown away by the range I get on my P3A). However, many people only fly LOS, therefore not requiring the range that Lightbridge offers. I'm a bit surprised that it was discontinued. Hopefully there are people out there getting them for a great price while they're still around.