If you aren't killing the stock sliders, there is really no point in spending the money on CVD's IMO. It's not like they really add to performance, they only add strength if you need it.
True, I broke one of my out drives and I just replaced everything. I have seen metal out drives somewhere so that is another option.
I'm just a big fan of, it ain't broke, don't fix it. It's one thing to add parts that enhance performance or even looks. However, for something such as this, there's no real point unless you need the added strength.