A calin made by Tyron is that these bands must be good, cos the emergency services use them. http://www.caravan-advice.co.uk/tyron-bands.html Any current or retired members able to back up this claim. Personaly I think they're just very well marketed hype.
i fit these on caravans and can say that they do the job as advertised..ive heard customers stories and seen the aftermath of a blow out and how the tyron band saved the caravan and can help with the control of your vehicle to pull over safely 
As far as I understand it, a Tyron band stops the tyre from moving sideways under hard cornering, more applicable on older rims without a safety lip, so how does it work better than the safety lip/hump of a modern rim? Your tyre will stay put. As Chris said the other day, even at speed, he wasn't really aware that his tyre had blown to start with and his tyre didn't come off the rim.
How do these people with bands fitted know that the band had anything to do with the tyre not coming off the rim? IMHO they don't, and have just swallowed a good marketing hype. I'd have thought that the steel belt would be more significant in keeping the caravan in one piece.