I actually have experience with this antenna - well, at least the original version from the original company (there is an interesting story there). This is the same maker, though.
The first thing to understand is that purpose of any antenna like this is to provide portability, mobility, and simple setup and takedown in a small package. Its purpose is not to provide the most efficient HF antenna possible. The same can be said for any antenna with a similar design such as the Buddistick.
Calling an antenna like this "snake oil" is unfair unless the manufacturer is making performance claims which are false. Unless I missed it, I didn't see any outrageous performance claims on the manufacturer's website. The performance of this particular antenna is no worse (and probably a little better) than hamsticks that tons of hams run in their mobile every day. I would hope that people that choose an antenna like this are doing so for the portability and size requirements over unrealistic performance expectations.
I see that they've made several small improvements over the one I played with, including the radial system which was an issue originally. I used the older version of this antenna quite a bit at RV campgrounds and other places where large antennas could not be erected. I had fun and made contacts - a lot of them. The antenna is quite a compromise, so band conditions are really important.
You didn't state what you're trying to accomplish or why you're looking at an antenna like this. Maybe it suits your purpose or maybe it doesn't, but we need more information.