Never used one of those. I still go with the scent free soap, spray etc.
Here is an article on what I do. http://www.deerhuntersclub.com/tips/scent-elimination/
Even though I do go through the trouble to do all that wind is still most important. I think its darn near impossible to remove all scent. Especially for me as I eat on my crackers and Snickers bar.
I have been busted a lot less since I started washing my clothes and spraying everything down with scent killer (following that article) than when I did nothing at all.