Mike,
I think the biggest problem was that the market got flooded with counterfeit MSD 6A units, and MSD got several units that were sent in complaining about performance. From what I recall the REAL 6A units were fine, but it was difficult to tell the difference. BangShift put out this article explaining how to tell - https://bangshift.com/general-news/s...ion-vs-a-fake/
I'm not sure if the counterfeits are still as big a problem or not, but I wouldn't by a bargain priced unit from EvilBay!!