I’m not able to search for it now, but there was a review of MA Silvers as an HT rig... in general the Silver line reviews very well. I’ve auditioned the 300 and 500. Regardless, there were no real complaints about the FX, just mainly that it didn’t do anything to stand out in the crowd.
Do 40 as a pair, or each? If you want surrounds, do it. They retail much higher than that.