Carl, the techs I know usually carry a couple of different ones; if one doesn't work ok they try the other. I have one on my truck (a tech gave me) I use for testing when dispatched. I've never paid attention to model but he said it's the best. I've seen it sync up when others wouldn't. You'll be ok - I still want your Express. Afterall, WHO helped you get it running?? For backup, get a Lucent Winmodem
