Hi,
Yes this is the product they are talking about.
And they are briefly discussed in this post on reptileforums.co.uk.
And here are some more links with information about them;
link1.
Link 2.
Link 3.
There certainly seem to be people who find them very effective - and, as long as you were ok with the idea of even more li'l bugs running around the place for a time, they might be an ideal solution for those of you with sensitive animals.
It should be pointed out it's a one or the other deal with these methods before someone complains they bought both and PAM killed the good mites as well.
I havent found anyone who has used them with tarantulas yet but they could be ideal in that situation.
**edit**
Tarantulas are mentioned at the bottom of this page so should be all right.
**end edit**
dr del