Live Sand?

[sarzeff]

Ok, I have a question about live sand. Basically wanting to know, is it worth the cost? The guy at the LFS where I used to live told me don't bother, it's the biggest scam out there. Just use live rock and regular subtrate. The person at the LFS where I just moved to, says LS is an absolute MUST.

It seems alot of people use it but I noticed alot of you seem to scoff at it as well. I searched and couldn't find an existing thread so I thought it would be a good question to put out there. I'm curious because if it is worth the cost, I'd like to take out what I currently have for substrate and get some live sand before I put in my live rock.