I don't know this product, but we've used 'killitch' and have been extremely happy with it. We find that it now only keeps the flies that cause sweet itch (pretty effective!!) but also if we don't bother to use it for a couple of weeks and a problem develops, apply it daily for a few days and the problem clears up really well.

The manufacturers say to ideally start it before there is a problem. However, we find it works well on existing ones.

No, I don't work for the company. Just super impressed with the product. If you want a quick result, I would suggest that you use it more often than the package says is neccessary. When we have a bad case, we use it every day or second day until it clears. We normally see a big difference within a few days or a week.

If one uses it from the start of the season on a regular basis, we find that it is pretty effective. However, we have a number of owners who board horses with us who don't want to pay for this, so they generally wait until it gets bad, then have us use Killitch to clear it up.

Although it is great against 'switch itch', useless against most other things (e.g. horseflies). So I can suggest it for this specific application, but not for general fly issues. For that, we use either a fly rug (fly sheet) or a good fly repellant.

I would also suggest that you use both killitch and the fly rug until the symptoms have cleared. Then you could try and see if you can get away with just one or the other.