We have a 2004 Honda CR-V with the Invisibrake. We had a fuse bypass/kill switch installed and have never had a problem with the battery draining.
Here's something else to consider: the ignition key. Leaving the key in the ignition while you're stopped is just a little too tempting to would-be thieves who can disconnect the car, break in and drive away. We went to the Honda dealer and paid about $35 to have a key made that will do everything *except* start the car. Very inexpensive anti-theft device.
