I took the NOLS/WMI WEMT course 3.5 years ago. I was hired shortly thereafter by a private ambulance company with ALS contracts in the Denver Metro area (Colorado). The only disadvantage I can think of is the strong focus on using wilderness first aid equipment ie. a small first aid kit, tent...
Dont forget proper nutrition ie. eating clean. This will by far help the most with getting results, whatever they may be. For a quick spot of info on this, check out http://forums.menshealth.com/eve/forums/a/tpc/f/295109121/m/721103321
Good luck!