I did not know they were working on a longer lasting strip. I think if they could come up with one it would be a very good product. I have used the product and that is really the only complaint I have is it just does not last long enough. You get a good mite drop the first couple days then its done. If they could get it to last just half a brood cycle that would be a big improvement. Then just two treatments should knock the mites back pretty good.
One good thing about hopsgaurd is it a contact miticide so you don't have to worry about temperature. Formic has such a narrow temp range that it is hard to find a good time of year to use it here in the S.E.