I don't know where you read that it is a minor problem but it is not minor.
Passport is an improved version of LTR. It allows a system to do many things that conventional LTR will not do. However, because the protocol is different, it cannot be trunktracked. What this means is that you have to listen to every conversation on a fairly busy system in order to hear the units you wish to. This includes taxis, landscapers, contractors, prison vans as well as the ambulances. Then when you get an ambulance conversation, you cannot just sit on that channel. The first user that keys the radio gets the HOME channel. Someone on another talkgroup that talks at the same time gets pushed to another freq. The channels the replies are on will depend on who keys up first.
Then to top it all off, there is an annoying keyup every few seconds on almost every channel. Some folks will try not having a delay but you will still hear them.
The traffic that the Passport system carries is the ASM/Aetna emergency dispatch stuff. There are some users on the conventional LTR part but not what you would need to hear the EMS units.
Good luck if you want to try to listen to it.
chris