As for Airborne - I like it. I just wish it hadn't gotten so relatively expensive over since it's popularity started to rise. However, I usually stick to doses of Emergen-C, twice a day, during cold and flu season.
As for Zicam - That whole 'tasteless' syndrome is sort of an anomaly. However, there are still those documented cases where people have lost their sense of smell from consistent, continuous use of the nasal swabs. But since smell and taste are very much intertwined... Hmm.. But I've used Zicam too, and it's always worked for me. I like the Allergy formula.