(part 4)
LG did a good job with the software on the G3. I loved the clean load-out on my Nexus and I had played with the G2 a little bit a while back and was not a fan... But the difference between the G2 and G3 is striking. Where the G2 tried a little too hard to be like Touchwiz, the G3 had a sneakily light touch on Android, and it looks to have drawn some inspiration from the upcoming Material Design approach. After some relatively minor tweaks, including changing the laucher to GNL, you'd have a hard time telling the difference between my G3 and a Nexus 5 that had a CM11 theme loaded (there are several that are dead on ringers for this).
About lag.... I'm not really seeing it, or as bad as some make it out to be. It's not as smooth as a stock, unmodified Nexus 5.. but it's not that far off, and it has about as much jitter in spots as my Nexus 5 had when I dropped the dpi density to 400 and animations to .5x.... I have ZERO complaints about the video perfomance... Like I've mentioned before.. smoothness is more app-dependent than device dependent.
So, in conclusion.... Nexus owners need not worry about 'losing' Android if they go to a G3. The G3's software is pretty configurable and can be easily changed to look and feel a lot like a Nexus device. Outside of that, I've found that nearly everything on this phone is a step up... radios (including GPS), speaker (louder), camera, display. About the only thing lost is those speedy updates directly from Google and the custom ROMs...
About custom stuff... There really isn't any. And it remains to be seen how quickly we get any since the only variant out there that has an unlocked bootloader is from T-Mobile (D851).. Luckily, that's what I have.... LG has released the sources for both the system and the kernel though, so that's done at least.