Bruce, The band type does not create or add any risk due to its design.

Any type with an external sensor on a valve stem has some potential risk, but with Joe's approach using a second valve stem he has minimized the potential.

In order for it to work, a sensor opens the Schrader valve so it can read the internal tire pressure. As a result you are totally dependent on the seal between the sensor and the valve stem. A secondary risk is the weight of some sensors has the potential to create a fatigue failure of the stem if the stem is long and has a bend.

But by putting in a second straight stem (or a bent one as long as it is very short) that risk is minimized. The sensor never needs to be disturbed to add air, and the valve stem for adding air has two seals, the Schrader valve, and the valve stem cap.

The question is always of relative risk versus cost versus ease of use or features.