It depends on your fermenter. The people saying no way, don't have a fermenter with a spigot. I received a few ported better bottles from my BIL with spigots. I really don't like using them, because even though I have used them several times, I still know one of these days they are going to leak and spill my precious beer.
That being said, the inside of the spigot has a tube that can be moved up or down. point it down the first few days (so it doesn't fill with sediment) then rotate it up. The yeast cake will compact under it, and you can bottle with it no problem, rotating down as you go to get all of the beer without any sediment. I keg, so bottling sugar isn't an issue.