I initially put flourite black sand in my 90g for a few weeks. It had a grayish look, not pure black -still looked good though. I saw TMS in a LFS and it looked a lot more pure dark black so I switched.
I recently upgraded to an ehiem 2262 on this tank - I have the spray bar aimed across the surface of the tank. On the opposite side of tank from spray bar, the TMS drifts very badly - its too light so after a couple hours the tank bottom is down to glass, and big drifts have accumulated, screwing up the whole flow of the tank and leaving dead spots for the large amount of oscar waste in my tank to accumulate.
I have tried using plants, wood, rocks, etc to stop the drifting, nothing has worked.
I'm going to switch to either flourite black sand or just flourite black gravel, not sure yet (sold my old black sand but not sure if it will have the same drifting problems or if its heavy enough to stay with the 2262.)
To give you an even better idea on the drifting - my hydor koralia NANO makes this sand drift, even if i point it parallel to the sand about 6 inches off the sand. Its very light.