I've never used them, so I can't/won't comment on efficacy.
BUTT..hang around long enough, and you'll discover there's a thing I coined as the "board de jour phenomenon"
It happens when one or two of the heavyweight "board stars" starts promoting something they use or sell as great..
all the pack followers jump on the bandwagon and parrot the same
everything from soups to nutz.
Big Boss sprayers
Recoil porty (red board days)
Mytee M5 porty
's tweak on Harvard
and don't get me started on wands...
that's just a few of the "de jour" pool that rose to fame
Some of them were good, some were garbage. (02 cough..cough)
The wise and observant 10%'er will sort it out in their first 3-5 years on the carpet.