Well I have a Google Nexus 5 32GB, I just chuck it in my front jeans pockets or whatever I'm wearing, no case on it as all the other phones I've had as I also place my phones into Brodit car holders.
I don't really notice the phone is there to be honest, but I have somehow managed to turn the Nexus 5 off whilst in my pocket.
I find the build pretty good for a plastic phone, the screen though does have one scratch on the front but it's not too bad, it also has a funny small patch which you can only see with the screen off but I have a feeling I caused that by having my keys or something in my pocket with the phone sometime... yeah Gorilla glass 3 is good, but the best hardest wearing phone glass I have had so far was the front glass on my iPhone 4.
I much prefer stock Android, and I don't bother rooting or installing custom roms, although I have to state I have been through all that phase with a cheap Ainol tablet I had.
But I feel no need to do that with my 2012 Nexus 7 or Nexus 5, yet it's great to know you CAN do all that if you ever feel the need for more performance out of them.