Let me clarify about the PocketComm. It is a perfect companion for cell phone such as T-Mobile Sidekick or BlackBerry with built-in cell phone service. The PocketComm product is not competing with a pager; it is entirely different. It's like having two best means of communication in one package.
What if the pager/email service is down but the cell phone service is still up? You can make a quick call through the relay service (full TTY or VCO) or directly to other TTY user. Also, regular two-way pager doesn’t have same coverage as cell phone.
Also, keep in mind that you can call 911 directly via PocketComm if you have an emergency. In very near future, the 911 call center will have the ability to pin-point where you are because of cell phone's technology. Some cell phones already have built-in GPS and some cell phone service providers have the ability to do that without built-in GPS.
The email & instant messenger is a "store & forward" technology. That means if one of the server is down or extremely busy or the signal is lost, the message will be stored until that server or signal is available again and forward that message to next server and so forth. With PocketComm, it is not "store & forward" -- it is REAL TIME conversation.
Personally, I have Nextel BlackBerry 6510 and it’s great! I can call 911 in an emergency or if need to talk with someone real quick on cell phone. I use email all the time and prefer to use it. It works great all way on the freeway between Las Vegas and Los Angeles. I used to have RIM 950 and RIM 857, which do not work between Las Vegas and Barstow, CA and part between Barstow, CA and Victorville, CA. The Nextel BlackBerry works ALL the way and that is a good feeling to know that I can be reached in case of emergency via email/cell phone and I can call for 911 with PocketComm instantly.
That's something to think about.