I'm familiar and some close friends in the Mobile, AL were very satisfied with that type of arrangement until the need for specialists proved quite expensive.
For instance, the injury Bru just sustained will not be successfully covered via that situation unless an orthopedic surgeon is involved, which they generally aren't. Getting the MRI done, the OR booked, the surgeon and surgery team booked, etc will not be cheap.
If you're going to pay $100/month + a catastrophic, high deductible premium also, I'm unsure you're going to save too much money.
And before you say Bru's injury is a sports injury, I've seen the post-op x-rays of a similar break to Bru's, including plenty of screws and a plate or two, from a person getting pulled off a curb while walking a large dog.
I like alternatives to "normal insurance" but if you lead an active life or your kids lead an active life, it's a risk-benefit dance and the older you get, the riskier a cardiac or vascular event becomes.