I thought this sounded like one of the most disgusting things ever, but I had a friend that swore by her neti pot. After years of suffering from allergies and colds, I figured it was finally worth a try. My friend has a lovely ceramic neti pot, but honestly I purchased the Rhino Horn simply because I couldn't resist the horrible photo on the product's box! The woman using it looked so uncomfortable that I couldn't believe they were actually using it to sell the product (but I guess it worked, didn't it?!). Anyway, it wasn't long before I was making a similar face of discomfort in my own bathroom mirror. Yes, it feels incredibly bizarre to have water running through your head at first, but...Oh, the glorious feeling afterwards! If I remember to use this and Emergen-C when I'm starting to feel just a bit worn down, I don't actually get sick.
The design of this neti pot makes it easy to use, and the plastic body (though not glamourous) makes it very lightweight so it's easily packable. It's especially great to use if you're travelling on airplanes.