Here's my story:
Purchased a KMR 13" mag/alum rail system when they first released.
Served me well for about 18 months. Then I took all my accessories off it to repaint. I noticed that some of the KeyMod slots had deformed: two where my BCM foregrip was installed, and two where I had a DD KeyMod light mount installed. I emailed BCM, at 4 PM on a Sunday. Next day at 7 AM, there's an email from BCM, with an RMA form. They said they inspect it, and repair it possible. A few days go by, then I mailed it out USPS last Wednesday. BCM received it this past Monday and said it was a "manufacturing defect", and they would replace it. I asked if they could send a 15" KMR-A version, to prevent deformation, and they said "sure, no problem".
So, long story short, they stood behind their product and gave me a free replacement.
A+ in my book.
My next rifle will definitely be BCM. Great company.
-Cross posted on M4C