PharmD,
Whether or not we 'recommend' the EMG should be irrelevant. What matters is what it will take for you to have peace of mind with whatever diagnosed you receive (if you get one at all!). That said, I have been in your shoes so, at the risk of sounding any false alarms, here's my (shortened) story.
Slurred speech and 'shaking' in right hand noticed in Apr 2011. Went to my PCM, who ordered MRI/CT, etc to check for stroke, MS, Bell's Palsy and whatever else. Tests all negative, so off to the neuro I go. In the meantime, noticed I got muscle fatigue quickly and with seemingly little reason. Anyway, neuro does the in-office testing in Aug 2011 and all is 'normal' WRT reflex, strength, tone. Schedules the EMG at his office (done by a tech who comes in bi-weekly) and a month later he reads the results and says "I don't know what you have, but it isn't ALS. Come back in six months." My PCM wasn't comfortable with that (neither was I!) so we got a referreal to UNC hospital for another neuro exam. Same strength and reflex tests, same results in Oct 2011. This guy; however, saw the fasics in my arm and tongue (which was wigglin' like a demon in church!) and ordered another EMG that he did himself a week later. He read the tests for about 30 miniutes and came back with the most unpleasant diagnosed..."Bulbar onset ALS."
So, not saying your second opinion will go the same way, but I decided to seek a second opinion for my peace of mind. And, no matter if it had been negative (how I wish!), the time and money would have been well spent for that reassurance.
In the meantime, whatever you decide, don't borrow trouble! Make your decision and rest in it until you have an answer.