I go for Metal Slim Transparent. 

I think that problem is for earlier software when I first got the phone in May.
Updates after that solved the problem.
Haven't heard anyone complaining about unresponsive home button for a while now.

I am using it. regarding sensitivity, yes it will drop very slightly... usually u just lightly touch but now need extra 10% to touch it but wont make so big difference....

I think it's a gimmick after all. There are no scratch-resistant screen / glass protector. Just be careful with it. Glass is slightly better than plastic of course.

Well, I dont know how they do it in youtube test. Glass M is korea one right? It's cheaper than SGP

Try plenty of keys or screw 
it will scratch definately, I hate screen protector myself but I rather the scratch not on my device actual screen.

overall, it still scratchable

only reason for me to buy glass screen protector is the touch feeling. Feel like touch actual glass.
Screws definately will scratch! 

post some pic here after you get yours 

haven't get my One lah    waiting for Red version else I will go for black

Either you give the wrong tracking number or that thing just been posted is it?
If it is the latter, you have to wait for a while for it to be in the system.

For PosLaju, let say i post the item today. Around 9 pm only start to be in the system for tracking.
Not sure about Pos Express

Poslaju n pos ekspress online tracking is hopelessly poor. You would expect a update will be auto done once package is scan but apparently the update is done separately by a different person. In this age of technology they are indeed far behind. I would even say 9/10 times I received my stuffs system will show either none or under process. I received stuffs from poslaju 2-3 times a month n I always go online to check their update "efficiency"