I've only done one, and it was about two years ago... but from what I remember, the report was just fine and reasonable, nicely laid out. As was the shop itself. Not bad at all.
I'm almost certain that the reason it takes so long, and is so difficult, for these shops to be filled... is that the shopper is required to be convincing as the athletic type ~ hiking, mountain climbing, skiing/snowboarding, and whatever other athletic pursuits the store caters to.
I get the feeling that a lot of shoppers are a bit, uh, older... and, um, un-athletic... and therefore don't qualify.
*I* certainly don't... the only reason I got to do that one I did (decent bonus on it) was because a.) they were desperate... and b.) it was December, and they allowed my non-athletic self to present a scenario as if I was shopping for a gift for an athletic friend/family.
I haven't seen them offer the gift scenario since. I even emailed and offered to do one with that scenario for them, last December, when they were seeming desperate and not getting the shop filled. They said they couldn't do that any more.
So... if you could pull off that you're athletic, I'd advise you to go for it.
Practitioner of the Nerdly Arts.