If, for some reason, you need to get your license simultaneously in 3 or 4 states, FCVS is probably worth it. Otherwise, just buck up and do it yourself. Most states provide some sort of mechanism for you to inquire about how things are going with your application during the process. If you use FCVS you first have to contact them then they have to contact the state, adding an unnecessary layer of complexity.
I think the main reason to use FCVS is to have a central repository for all the info you need to submit when you want to get a license in a different state.
What would be better would be universal reciprocity. Is there any state that doesn't, at a minimum, require you to prove that you've completed med school, the Steps and a certain amount of post-grad training? (This is kind of a rhetorical question since I know there are variations b/w states for DOs and FMGs but for US Allo grads this holds true.) So if you have a license in state X, you shouldn't need to provide yet another copy of your birth cert, diploma, Dean's Letter/Transcript, intern completion certificate/PGY1 training declaration and Step scores when applying State Y. You should only have to provide whatever state specific info they need (fingerprints, NPDB report, background check, whatever) rather than starting from square one. I don't really care about having to pay all of the fees again but I already wasted a huge amt of time putting that stuff together once, making me do it a second time is just an excuse to employ more low-level bureaucrats. Having said that, w/ the exception of the Dean's Letter, I requested or made extra copies of pretty much every form/document that my state licensing board asked me for in preparation for th next time I have to go through this insanity.
A nation-wide license would be OK too but I'm OK w/ baby steps.