I have had the best luck with the old "crappy" thin acrylic siphons that are glued together and have a hose stuck on them. I have been recently trying to buy some new ones and it seem like everyone is trying to redesign the wheel and make sophisticated siphons that either don't stay in one piece, or just plain suck. I just bought one in a LFS in Hastings that seems to be simple and useful, but don't remember a brand. I am also interested in what others have had luck with