The Boomerang unit is very sensitive to movement when armed. Just unzipping my rack bag to put something away will cause the audible alarm to sound and send a text to my phone. The unit is secured to the water bottle connections with extra long security screws (need a special security bit to secure the screw). You would need to move extremely slow to unscrew and not move the bike when armed. If the bike isn't armed, someone can take their time to remove or just take a hammer to it if in a hurry. I've heard of folks putting superglue in the screwhead to slow down the thief even more (use acetone or nail polish remover to access the screw).
My bikes are covered under my USAA homeowners insurance at home or away. The lowest deductible I can get is $500 per incident; but, it covers my entire house and stuff for about $1000 per year. Separate bike insurance would cover more at a much lower deductible. I haven't checked and I'm sure the price would run an additional $15-$30 per month most likely depending on the type of coverage. I also did the National Bike Registry, Bike Index Org, and local law enforcement bike registry system. It was $25 for 5 bike for 10 years for National Bike Registry; but, everything else was free.
I'm able to store my bikes in my garage. The wife and I travel with our bikes and I worry about someone stealing the bikes off the vehicle bike rack at a Hotel parking lot at night. We have problems in my home town with thieves targeting out of state plates for break-ins at hotels because those vehicles are loaded down with stuff. I figured it would be the same issue on the road when we travel with the bikes. We try and request a hotel on the first floor and remove the bikes at night. That only happens about 15% of the time.
I figure a layered security is the best way:
- remove rack bags, accessories, battery, and lights for travel
- 5 foot Xena 14mm chain
- two Xena XSU 18mm u-bolt locks
- Boomerang units
- 12 foot cable lock (to attach bikes to SUV hitch)
- travel bike cover large enough to cover two ebikes and rack at night (out of sight, out of mind)
I figured with all those layers, the Boomerang unit will give me time to check things out while they are defeating each layer. My vote would be security layers with some type of active monitoring if you are able to respond in time. If not, the passive approach (like the camera) would be the next best thing to document the act and registry of the bike to find down the road.