Personally, I wouldnt use it, but I also doubt there would be further attacks so soon (although you clearly cant predict what these groups will do).

I am not convinced it was ETA yet - it seems a very big operation, and dont they usually say they have done an attack? Maybe they havent been stopping lorries etc. but these were bombs on trains as I understand it - it must be very difficult to stop someone carrying a case full of explosives onto a train?