I have ScanTech right control arm and OEM left control arm. My dealer said scantech has already gone bad (only three monts after install). This might be due to reason that they want to screw me, but they might have a more strict way of controlling them, who knows? I still keep it and did not have it controlled by an indie mechanic. However, the one before the scantech was also aftermarket (i'm not sure about the brand, the previous owner had it replaced one week before I bought it) and the indie mechanic who does my PA state inspection said that one failed the inspection (one year of usage?). That's why I had it replaced with scantech. We'll see about this one next year.
ihsan