There's no evidence whatsoever that zone therapy works, only anecdotal "evidence". Being relaxed from a foot massage proves nothing. Drinking two beers makes most people relaxed as well.
This is clearly an area of pseudo-science. If you wish to try it out, I won't stand in your way, but at least consider reading other articles before you spend a copious amount of money on it.
And I repeat; the is absolutely no reliable evidence that it works for anything. Given the amount of time that it has been around, the lack of evidence suggests (but does not sufficiently prove) that it does not work.
I think this article does a terrible job of representing reflexology, exactly because it doesn't properly explain why people are skeptical. The lack of evidence is concerning, and pointing out that it was "rediscovered by physicians" is an appalling appeal to authority.
The last line is especially concerning:"Thousands of years of practice and millions of successful results certainly make it worth investigating."
For thousands of years, people have believed all manner of craziness, and the testimony of "millions" have little bearing on anything; it's anecdotal evidence and is inconsequential to the validity of the treatment.
Without a proper scientific study, we can't be sure how many of these "success stories" are actually due to the reflexologic treatment. We can't rule out that the body would have handled the healing process on its own in the same amount of time.
A foot massage may have a positive effect on the body, but that hardly proves the existence of meridian lines.
Conclusion: There's little reason to think this works. If you disagree, make a scientific study and get it peer-reviewed.