It's not heavy at all. It's thicker than a regular screen protector, but it's not as thick as you think when you think of "glass".
It's as thick as hmmm... like a credit card.
But I'll definitely let you know tomorrow.
If you never had a glass screen protector before -it's so much better than regular plastic ones.
BTW, as a tip: If you buy it, don't get it directly from Spigen's site. Get it under Spigen but through Amazon. Then you can use your Amazon Prime trial if you don't have Prime, and you'll get it in 3 days.
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I like it without the cut-out as well. But it doesn't bother me much.
....can you feel the lip as obviously the glass protector does not go all the way to the edge of the iPhone 6 screen due to the curve?!