It sounds promising, but I don't like the non-user replaceable sensors. What happens when the battery dies while you're out on the road? To me user replaceable is pretty much a must have.
Having all tires showing isn't that big of a deal. I never spend any amount of time looking at the monitor anyway, since taking eyes off the road is rarely a good idea. An audible alert is a necessity, visual is secondary.
Also a loss of signal alert is necessary with a quick response time. What kind of wireless connection is less important to me than consistent/reliable connection.