These guys are great and they are certified. Sean does stand behind their work! I've never heard a deraugatory comment concerning their work. Robert M. used the terms ""dishonest, overcharging, threatened reprisals"" in describing his experience with High Tech. These are strong accusations! He did not substantiate any of them. It would appear that Robert had some satisfaction at High Tech if he ""went there for a few years off and on."" Why would you return if they didn't provide ""reliable work""? Incidentally Robert, your handle on the English language could use some improvemet. (You are not smarter than a 5th grader).