I used Maqs for the first time this year 4 weeks ago on a single poly hive that was in an out apiary.
It was a swarm from last year and I noticed I had a small number of bees with deformed wings so thought an experimental treatment was in order.
So opened the packet and wow does that stuff stink.
I put it on the top of the brood frames with a fully empty super on the top.
I have acrylic crown boards and could see the net effect was that unlike normal the bees didn't even venture above the frames the 2 nights I inspected. I had a huge mite drop :-(
After 7 days treatment a quick inspection showed she stopped laying and it was a week before she decided to go again.
My conclusion, this stuff is effective but feels a little like I am gassing them.
I will apply to my main apiary once I have removed all supers as I don't feel too comfortable applying during flow.
Am also wondering could this also be used earlier in season for swarm prevention during build up to interrupt brood cycle.