I did, when I bought the device. And if the manufacturer does a good job, I'll recommend them to friends and family and likely buy more of their products.
The FOSS community does most of the heavy lifting with security updates anyway. Most of these things are running Linux, so they've already helped themselves to that community's work.
If you're meeting the cycler in its orbit, you're already on a free return trajectory back to Earth by definition. You need another burn if you want to stop at Mars and another burn after that to leave and get back on a trajectory to Earth. In any event, you need to bring all of that propellant one way or another through some combination of independent launches. I'm still not seeing what a rendezvous with the cycler craft is doing for an unmanned mission. Any delta-v you take from the cycler has to be put back via refueling or reboosting at some point or another.