I've tried three different speed feeds on my z2 and only one of the has been on par. I would avoid the virtue crown2 and the Empires own one like the plague, it is a genuine struggle to get paint in and the term 'speedfeed' is tremendously ambitious.
I now use an Exalt one and it is sublime and the best part is it's dirt cheap. I think they are about £13 posted on RAP4?
So an amazing speedfeed but half the price of any others. Trust me, you may not be a big fan of speed feeds now but once you see how quickly you can dump paint in there you'll be in love.