I used the colorquartz in my tank. It looks great, doesn't compact, doesn't get moved much by flow (less than pool filter sand), and I've seen acceptable plant growth with just root tabs. I believe I have the S grade (it's the perfectly spherical one). The particle size is relatively small, but amazingly uniform.
The only negative is that it does need a very thorough washing. It tends to have a lot of dust out of the bag.
It has been up for a year with only the loss of 2 older platies. I have 6 rainbowfish, 2 bristlenoses, 1 otto, and a dozen botine loaches all been in there since shortly after startup. You shouldn't see any issues with it. There is some cichlid forum with an huge thread dedicated to these tanks where I originally found out about the product.