Had the 4-6" DSB for ~3 years, had some cyano when starting but could have been me just starting, using tap water etc, but did clear up. When I moved and dumped the sand, didn't smell much different than my water does now. Really it smelt fine.
When I set up the current tank did BB with the plan of adding either a SSB (1-2") or a DSB later but the BB sort of grew on me so never bothered. Now years later with the coralline people will come over and I'll mention the BB idea and they'll say didn't notice there was no sand.
Personally, do have to say I like sand the best for the looks plus the extra diversity to what you can keep over a BB, just not enough the add a bed myself.
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