Handspring has a FAQ entry regarding some of the questions people have had about why the module isn't currently being offered seperately. Glenayre will at some point offer the @ctiveLink seperately, and there will be an upgrade policy for current Visor owners.
I tested the @ctiveLink in my normal Visor Deluxe and was able to send and receive without any problems. Depending on your location, you may or may not need to get an "optimized Visor."
I also had no problems with the @ctiveLink while my wife and I celebrated our 2nd anniversary in Galveston. Thank you to all who sent in their best wishes while I was out.