DIY Flood Protection Solution?

A DIY product which the manufacturers claim stops flood water coming in through doors 100%, looks like a possible relatively low cost solution for many of the flooded households.
 

If this system works, and looking at this video, it does, then the cost of fitting would be negligible compared to insurance claims and time taken to fill and distribute sand bags.  Nowpublic flood related articles: 

Humanitarian crisis: thousands without power UK Floods - Cause and Effect Two dead after flooding accident 

National Flood Appeal Give to the Red Cross Na... A family were forced to sleep in a supermarket

Hundreds evacuated as Thames bursts its banks

Toilet crab attack fear revealed by Richmond & Twickenham
Times

Flood victims are warned of Virus Danger

BRITISH
FLOODS

UK FLOODS - Emergency services have been battling to deliver Fresh
Water To 350,000 People

Bikes under water in Wiltshire

Power restored as floods recede

Honours to reward 'unsung heroes'

UK floods spark call for wartime spirit

Floods swamp farmland and roads

Brown flies in to see flood damage
 
Floods cause misery across Britain
 
Thousands Cut Off In UK's Worst Floods In Living Memory And Things
Are About To Get worse
 
Britain has again been hit by freak storms
 
Looting, panic buying -- and a water shortage
 
Rain Didn't Stop Play (This Time!) 
 
IS IT GLOBAL WARMING ... OR IS MOTHER EARTH