I tried the spray in the Cairngorms in late June where even the staff at the Glenmore campsite said that the midges were awful and I went pretty much unscathed. I did find that the joss sticks were very useful. Stuck in the ground around my bivvy bag under my tarp, their smoke acted as a very effective midge repellent and did not have a choking, chemical smell. As with all these things, there is no perfect solution but this stuff seems to be pretty good.