Yup, I have kolorscape in my tank. Do I like it? Not really. Does it work? Yes, very well. My phosphates are undetectable and my nitrates are never more than 15. I dont like the grain size tho.
Would I use it as my main in tank sand bed again? No I dont think so. I wont change it out tho. Ill be upgrading soon to a much larger tank and at that time Ill by some really nice arganite sand. I will say that if this is a starter tank for a larger one somtime in the near future then kolorscape is more than fine. No need to spend alot of money on expensive sand if your going to be upgrading. But if your planning on keeping this tank for years then go with the good stuff. And 1/2" - 1" is plenty for a shallow sand bet in my opinion.