Well, better balanced, yes. Better, not necessarily. For example, the MH aluminum head I bought for big bux is very well balanced. But they used the wrong alloy for the hub, it is too soft, and they used tiny 2mm setscrews to hold it on, they strip out very easily and due to the softness of the alloy the next size up 2.5 mm also strips out and by the time you get the right size 3mm setscrews in there the shaft hole is wallowed out so it will never be completely straight again. Just using 6061 or 7075 alloy would have prevented this totally, or using a collar arrangement to squeeze the shaft together would have worked better IMHO.
Yes, it sometimes vibrates, sometimes not, it always settles down once the blades find their lead/lag positions.
I am not bad-mouthing MicroHeli, I admire what they are doing, but I do think it could be done better, very easily and at minimal cost.
Maybe they are reading this post.