I just used mine this morning. It's a cheap plastic one from Walgreens, but it does the job.

I was incredibly stopped up last night before bed, and none of my cold/sinus pills were working, so I finally gave up and managed to go to sleep. This morning, I woke up and went, "Duh! Neti pot!" I can breathe out of one side after flushing things out, which is a lot better than I was doing.