There are always rave reviews and as many derogatory ones for any of the alternatives to slug pellets.
I encircled some raised beds with copper wire and that had no effect. I never tried adding a battery, which was an added version after simple copper wire/tape was found to be ineffective.
So far as I was aware, the first version of wool offered for slug control was dags, not clean wool.
As to comments about just making money for sheep farmers - UK wool, from commercial meat flocks, which is the vast majority, has no value anyway, hence the experiments with wool growth inhibitors to put a weak spot in the fibres, so that the wool is shed as it snaps at the weak spots. The industry has been searching for uses other than use as a simple fibre for many years - I use one MO supplier who sends frozen/chilled product wrapped in sheets of wool in tubes of very thin plastic.