I never understood starting a syphon with your mouth and risking eating fish water, when you could start it just as easily using gravity. I've always used the cheap not self-starting syphons - bucket on floor, syphon in tank, hold off the end of the syphon tube with your finger, fill the vac part up with water, take your finger off the tube end and stop it as soon as the water starts flowing through, refill the vac part, submerge the vac, take finger off the tube part to let the water flow again, instant syphon. You just have to it shake back and forth a few times if the flow rate seems slow.
That said, I just ordered a Python a couple of days ago after seeing how much folks here seems to love them. I'm looking forward to no more bucket trips and sloshed out water!