I use one of these as a third brake light. It is super bright and you can change the strobe patterns. If one of these doesn't get a drivers attention nothing will! I also have a front brake lock installed and when you engage the lock the brake strobe will continue to operate. This is a great feature if you have to stop on the side of the road. Much better than four way flashers.
This is my strobe of choice as well. These are
incredibly bright being EMS emergency lights. They're really too bright for brake lights at night if you don't carry a badge (and even then). Even during bright daylight cars will often stop farther behind me than normal.
A nice feature of the E lineup is a High/Low brightness option.The E line has an additional lead that reduces the brightness when connected to 12V. With a flick of an SPST switch power is reduced for night time use. I haven't bothered as I don't ride much at night but it's a good idea.
I also have the Pindell parking brake. But without additional wiring the ignition must be On unlike the four-way flashers. This is tough on the 1300's battery. Replacing the turn signal bulbs makes the flashers more effective and less hungry (but use an LED turn signal flasher not resistors).
One note on parking and strobing: We've had too many police officers struck by DUIs while they were parked with flashing lights resulting in deaths and severe injuries. Footage of a damaged Ford Explored/Interceptor was horrific and broke my heart.
For now the local CHP policy is not to use lights once the stop is made. There is no perfect answer so this is just an FYI to be aware of your surroundings and minimize exposure if and when at all possible especially at night.