I don't see the big problem with the price. That is normally what unlocked flagship phones go for. The Note 4 goes for $750 and HTC One M8 was $699.99 as launch. They aren't asking an outrageous price for the device that you are getting.
I can only speak from my experience but I have had the gallery lag everytime I open a folder. I have also have pretty poor battery life.
I'm using a 901s and all three buttons are lit pretty equally. Sadly there doesn't appear to be a way to alter the brightness in the settings.
As a big Samsung smartphone fan, I was hugely disappointed with the S4. Micro stutters and lag EVERYWHERE it drove me crazy.
I was really REALLY hoping the Note 3 with the S800 powerhouse will remedy the lag, according to the many videos so far...