I can only recite some information from a former EMT-B partner.
His first (and semi-frequent) assignment from them was to be the night admittance person. This means that you sit in a small box out front of the actual facility, kinda like a secretary. You are locked out from the actual facility. The door to the front only open when you buzz someone into them. Thus, when a walk-in pt is admitted, you are locked in a box without any significant backup with some very altered pts at times. I do not know your level of self defense, but this can be scary for anyone, and it was for him many many times, ultimately leading to his leaving employment with them. These are not the only pts admitted, often you get transfer rigs from other facilities and law enforcement drop offs. Again, once you sign for them, you are alone initially with the pt, but when they come from other places, they usually aren't spun out of their mind on meth.
He also stated that his EMT partners that he occasionally worked with that were recovering addicts were often of a much lower caliber of person than you would want on scene of a medical emergency. To the point where they did not understand some of the names of the gear, etc. This did not happen to him all the time.
On the positive side, he learned simple intake assessment skills very well, he got to experience some seizures, other ALOC calls, airway obstructions, and decisions to notify ALS or law enforcement. Some of these skills are hard to come by, especially if your first BLS gig is a nursing home transfer runner or CNA type work in some long term care situation.
From my understanding, the job pays between $11-12 per hour, standard in AZ for an EMT.
