There's not many other products in the market like this so it has little competition. It is a great product. I commute around Central London and it is largely quite good at attracting attention. However, there's still a large number of people who do not even notice when the sounder is going off. They are either deaf or the sound isn't distinctive enough to attract attention (it does sound like a personal attack alarm going off). I wish there was two triggers where either could activate the siren. This would allow it to be triggered from left or right hand. Sometimes, the side it is on is the side I am using for signalling so I can't press the button. The button switch is also a bit tricky to press, especially if it has turned around on the handle bar slightly. The mounting bracket is pretty weak, mine cracked after a very slight knock. The volume difference between the high and normal setting is not very much. The high volume setting sounds really loud in the house, but on the streets in London, it's not as loud. Vehicle drivers don't seem to notice the sound that much. Anyway, overall it's a great product and does fit on small bikes like the Brompton. However, I think something like the AirZound would be more effective but sadly this does not fit on the Brompton.