I've had a few frustrating experiences with their customer service, but they always made it right in the end and the biggest quibble was over lack of communication rather than bad attitude.
I've also had a BUNCH of solid transactions with them, and I consider them a 'go-to' vendor for much of my AR shopping needs.
-A conclusion is not a destination, it's simply a convenient place to stop thinking.-
-Reading a thing doesn't automatically make it so; repeating it doesn't necessarily make it any truer.-
-Every Texan should be a member of the Texas State Rifle Association.