Hey there,
I know a few people with sinus issues that use them, and they love 'em. I asked by oncologist about using one, and he mentioned that while they can rinse the nasal cavities well, they can also spread around any bad stuff (bacteria, virus, etc.) as well. If you're prone to infections, it's prob best to avoid them.
What's your issue Montague, general dryness or pollutants?