My wife bought one for me a few years ago when they first came out and then I got another one the next year. I've never had a problem with them. We're only allowed to run two lines per person in Michigan.
I mainly use mine in the dark, while watching TV, or when taking a nap. I had them on yesterday morning, but was never paged by a fish. I usually take them off soon after light to save on batteries. Since I'm using Slammer Tip-Ups and the fish is on when the flag goes up, I tend to stay close by and often hear when the Slammer arm slams down popping up the flag. I can always put my 209 primer caps in to alert me of a flag too.
The pic below shows how I rig my Strike Sensors. I use Velcro and attach them to small pieces of plastic for a base when using on the ice. For storage, I made the cord to the clip just the right length to wrap around the sending unit and clip back on itself thus preventing the switch from coming out. I also took a strip of Velcro and wrap it around the pager to hold the springy antenna to the side of the pager which I keep in my pocket. I keep the two senders, the pager, extra batteries, and my plastic bases in a Ziploc for storage.