Size - When I first opened the box and saw how gigantic it was in person, I thought "I have made a terrible mistake". However, after taking it out of the box and using it for a few days, I couldn't be more wrong. I'm not sure if it's the thinness or the weight, but it just doesn't feel as cumbersome as I expected. I really enjoy the screen real estate and it actually feels nice in the hand, more so because the sides are squared off and not rounded. The Lumia 1520 never felt right in my hand.
Screen- I know it's probably just me, but the screen looks a little washed out. It gives me much the same impression that the Nexus 5 did before I sent it back. When I use it on its own for a while, it looks nice, and I'm sure it's color accurate, but there are times when it just doesn't look good to me. I think it's the AMOLED effect, coming from oversaturated screens like the Note 3, Moto X, and LG G2, but I guess I'm a sucker for saturation. I also find the brightness to be a little on the low side. Much like the LG G2, I feel like I have to have it at around 80% for it to look right to me. On a better note, I was expecting the shatterproof film to bother me, but it doesn't.
Camera - I was prepared for the disappointment that is the camera on this device. Just about every review panned it. I love the camera features, but the image quality does leave something to be desired, even in daylight. I have tried all kinds of manual settings and lighting conditions. It's still a passable camera, but I can't help but feel that I'm missing out on better photos when I use it. It's probably my one biggest gripe with this phone. I found a flash diode you can install in the headphone jack for low light shots, but since photos aren't that much better in daylight, I doubt it would make much difference. I wish they had at least included the 13mp camera from the Xperia Z.
Overall, despite the negatives (for me) listed above, I really like this device overall. I like it way more than I thought I would. I'm still fighting battery life a little and trying to figure out how to use Stamina mode to best benefit, but I don't regret my purchase at all. I'm pretty sure I'll be keeping it and my next project is to find a nice clear case that shows off the beautiful purple back.