Assuming that site is legit, and just my personal opinion, of course...

Better off waiting until you're symptom-free, then getting this. It's cheaper, and can determine if you've already had it.

[Link]

The test for actually having it? With a 3-ish day turnaround? What's the point at some level. Good chance you'll be over it within 50% of that time.

That said, a real bummer if you take the test and then it returns negative.