I now have two embroidery machines, one of which is a Brother, the other a Singer Futura Quartet. I've used Robison-Anton thread with no problems, also a Mexican thread called Iris, as well as the thread from DesignsbySick.
The only thread the Brother doesn't like are the red colors from DesignsbySick. For some reason they keep shredding in my machine. I have to use other brands of red. I haven't tried the Floriani thread because the shop only sold the sets of colors, not individual ones. Since I've only embroidered two pieces with the Futura Quartet, I really can't tell you what it does and doesn't like.