i worked part time/per diem for a large private service for four years that does some 911 but mostly transport.
pros:
-they were awesome at working with my schedule--i got to pick my own.
-the majority of people i worked with were great (that includes most of the management which I think is rare)
-offers to do some crazy transports (i was once offered a transport that was almost 1000 miles away from base)
-we had the contract to do the psychiatric transfers from the area's major trauma center to surrounding psych facilities...some VERY interesting patients
cons:
-the pay was within range of most private companies (aka crappy).
-the allocation of resources was pathetic. for instance, they gave me a ton of uniforms and 2 winter jackets and fleece vests...but there were no AED's on many of the bls rigs
. although the semi defibs the I's and medics used were pretty nice.
-they were in such need of people that you could basically do anything and not get fired. while some saw this as a pro, i didn't since it greatly reduced professionalism and led to people stealing needles, fluid, etc. and failing to report when they broke/damaged something. one of our wheelchair vans went MISSING for 2 days and then mysteriosly reappeared. funny but sad.