On the other hand as someone who has gone on week long (and longer) hiking, kayaking, and most frequently canoeing trips in Canada I was completely unaware of this service, and would have been completely uninterested in it is I knew about it.
We just take it as it comes and deal with it...
It's pretty good for backcountry hiking/camping (or offroading in general) where you are potentially hours away from any kind of cellular service. Some of these weather radio stations have (had?) pretty good coverage. A cheapo radio that can receive weather radio frequencies could last weeks on a single battery charge. It's great to know if my planned hike for the next day is possible or if we should make alternate plans, or if a giant storm is due later in the day, that kind of thing. Once you've been out for a day or two, all the forecasts you had ahead of time are obsolete and incorrect, particularly in the mountains.
Yeah, forecasts are definitely pretty worthless past day 2 or 3, and I can see how someone could find it useful... but part of the charm with camping to me is definitely the decision making process being based on "look at the sky" and not "ask the technology". Definitely a personal taste sort of thing.