rober, I used MAQS last year. I buy them from a local guy so that I don't have to pay shipping. I noticed that they were very messy, for lack of a better word. It has been a few years since I had used them. I try to rotate my mite treatments. The previous year I used Apiguard. The year before that I did OA drip. I didn't know they had changed MAQS.
I did lose one queen out of 6 colonies. I don't know that I can say MAQS were the cause. I wasn't in a position to do regular hive inspections. Perhaps it was just her time.