I own and use daily a Sahara rig. Since buying it I haven't touched my KM's and Syrians. I have yet to get cancer for it not being a KM/Nour and I have yet to have the common chamber totally clog up with rust. However my lower lip fell off and I lost a lung but Hey! all is good.
Jk, I love mine and Zen is right I use it every day sometimes more than once a day. I abuse it heavily and it has yet to fail. I do not own a multi hose so have no input on the autoseal.