I'm pretty sure most of the people here already have a good system for gravel vacuuming, but I thought I might as well share this. I didn't know this thing existed until earlier while walking through my favorite LFS
I think it is amazing. It worked immediately. Only probably I had was I accidentally grabbed one of my ghost shrimp and he was difficult to get out...
Anyway, if you have just the self-starting siphon, get this bulb to go along with it. It's basically the same thing you use with pipettes (sorry, nerd moment).