I have a lot of Zev parts on that gun. Before I had the slide I though their parts were great. I never really had an issue with the quality of any of the other parts.
Customer service was terrible though. It took me like 3 weeks, 3 emails and 3 phone calls to get some springs I ordered that they didn't include in my shipment. I had ordered 2 of each weight and they shipped one of each.