I don't know anything about any of them, but this was in my inbox this morning from amazon. Looks interesting without having it hang from the windshield
http://www.amazon.com/gp/product/B00A1YB1VM/ref=pe_316240_29691910_email_1p_2_ti
I have started using those nasal strips. The wife says I don't snore nearly as much as I use to, and now my mouth and throat are not dried out in the morning. I must be sleeping with my mouth closed now.