Although it took a while for me to find it (or for them to appropirately post it), the Orlando Sentinel also reviewed The 39 Steps during Fringe.
Because I know they move things around, I have decided to post the review in its entirety:
On Monday we went up against almost 40 other acts to gain a minute or two (no more) of the most die-hard Fringe-going audience's attention at the Gauntlet wich is known as Fringe Preview.
Having never been in a show myself, I could only assume what to expect. I learned several things: