For those who must carry a pager, this is a great product. I've used it for 2 years, and I love it. My answer machine pages me whenever I get a message, and people love how quick I get back to them. The battery lasts 1-2 months, with up to 10 pages a day on vibrate mode. Also, if people call the 800 number to page you, their phone number is captured on caller id and sent to your watch (even if they have caller ID blocking!) I own 3 of these, as each time they have expired I have just bought another watch rather than reuppping at $99. I actually keep hoping these deals end, as one of the 3 watches is the version that not only has paging, but also holds 100 phone contacts as a mini-PIM, and I'd like to use it, but I'm too cheap to pay the higher paging fees.
I should add that I don't carry a cell-phone turned on, however. If you do, then this would be redundant.
Oh, it does work nationally. I was recently on Martha's Vineyard, and got paged from California on the beach!!!