Difference is they arent illegal and banned at Lewes - they are however in football stadia in the UK.
Even the Football Supporters Federation (who are pro-fan) are against their use and again to quote the link posted by Thunder Bolt - http://www.facepyrofacts.co.uk/facts.html#about
Also - how...
Abroad they look great - here they just look shite.
That said, it does help pinpoint where the idiots are as they will then get a life banning order. Is it really worth setting one off to just be banned from stadia for life ?