Had mine (Impact Jacket) for 3 months now and believe I'll stick with it. Here is a previous thread:
I'd recommend one of these to anyone.
I'm working on a simple magnetic reed switch gizmo that senses when I have it properly attached. My first prototype just lights a white LED tie-strapped next to the speedo. My next iteration will be a bit cleaner.
I've had no concerns about getting off the bike with the tether attached. If I forget, the tug is a reminder that doesn't trigger inflation. My bigger worry is the 2-3 times I've come to a stop and realized that I never connected it. No connection - no inflation! Hence the drive to build the attachment sensor.
BMW could integrate this into their bikes with full electronic interlock for under $10!