I lost one 350QX years ago due to a faulty propeller design flaw. They replaced it. One of the first commercially available 300+ class quads.
I've had over 2 dozen quads and hexes since then and never have had a landing that wasn't like a butterfly with sore feets. I've been flying 30 years a started flying helis when hardly anybody even knew what they were (RC, of course). I still have every quad and hex I have ever purchased and actively fly most of them, the last addition to the stable being the Mavic Pro about 2 weeks ago.