The customer service is great! They're always willing to go above an beyond for you as long your needs are met with their services - they know what it takes when working together; this makes them stand out from other companies that only want money without putting any effort into helping people succeed or getting results (i'm looking at YOU Google).
I've had many issues over my time using K2M but each one has been resolved quickly by contacting support via email/toll free number directly through phone call etc..