I'm running all the aluminum and love it. With some shimming to take up slop it is a tighter, more consistent handling car. You might notice a little more slop once you add the aluminum parts, but that can all be addressed. A pack of 4mm and 2.5mm shims comes in super handy with these cars from my experience, which is not a knock on their quality at all. The rear aluminum hubs also eliminated the lopsided toe-in on the left rear side. Easy fix with the pill inserts but the aluminum hubs cures it too.