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The screen is very nice with good viewing angles, although the color was a bit warmer than I was used to. It works well for reading or watching videos, but you may notice the lower resolution (720p) when zoomed out when web-browsing. The screen itself is larger than my last phone (Nexus 4) and is definitely a key reason to get this phone.

The Camera is a step-up from my old phone, but slightly more average than I was hoping. Colors are generally accurate, but very fine detail doesn't come through very well, especially in low-light. The Front camera was more of the same, but it was nice that has a wide lens to capture a larger area. The cameras are the same ones as seen in the LG G3, OnePlus One, and other flagship phones so software may improve this. The stock camera app can't mute the shutter sound so may want to use something else regardless. Overall pretty good for a smartphone, but definitely won't replace your DSLR. The camera can also store data to the MicroSD, so make sure to get one if you want turn this into your main shooter.
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The performance is more than adequate. When phones nowadays have more power than most people will ever use, this phone brings in just enough tech that you should be able to do anything the newest phones can do. All games and benchmarks play without a hitch, but some intense apps like high-end emulators (mainly PPSSPP) may not run as smoothly as the newest phones. Since this is such a specialized circumstance (and since even the highest-end phones can have issues on the same applications) I don't count it as a loss.

Calls sound average compared to modern phones and so does it's rear speaker. Very much equal to some of the best I've used in a phone, but that only means it's what you should expect. It does support HD Voice so if you are coming from an older device your may notice a nice quality improvement when calling someone who also has a newer device providing your carrier supports this. T-Mobile does.

The battery life is amazing. Even my first day with the phone and using the 63% charge the phone came with, I still got over 5 hours of on-screen time while running every benchmark in the book before I finally plugged in with 10% battery. That's longer than I've ever gotten on my other phones. It's safe to expect 9-10 hours of constant usage before needing to plugin, or 2-3 days of normal use. This was on the "Smart" power-saving mode, but there is also the "Endurance" mode if you want even more battery or "Normal" if you want a bit more performance. You can even charge other phones!

Overall this phone only does battery extremely well, but does everything else so adequately that it's really a steal for the price. The phone does run Android 4.3, but a 4.4 update is promised and hopefully more. Basically a Jumbo (if not slightly faster) Moto G LTE, it should keep everyone in need of a large phone satisfied.