I just looked up the foot print map and it appears to reach the southern Caribe, our preferred cruising grounds. It looks like a neat idea, but kind of expensive and questionable as it is a relatively new service and the footprint is mostly north & central America
the Raymarine equipment
and pay monthly for the service will proabably tear a cruising kitty apart!
I perfer the Marine HF and HAM as it is flexible, interactive, and generally someone is there who will rely if your reception
is poor. Besides the daily wx nets there are also some great weather routing servcies like Herb Southbound II (free) and Chris Parker (charges for the service, but anyone can listen) who not only provide the info for your area and destination
but helps to make sure you understand the impacts and the reasoning. I have heard them repeat and explain the forecast
for folks not quite catching it.
All of the wx folks will provide summries and impacts into your area if asked. We even had Eric (trini) correct some of NOAA's forecasts. So the wx reciever might be a good aid but don't discount the other sources for your all around wx services. We left with only short wave and wx recievers and quickly learned the value of two communications
especially with planning for a passage
or listening about huricanes!