Looks as if I need to update my anti bug supplies.
I would say that if you are still using a DEET based midge repellent then at the very least you need to give some of the other options a try.
I currently use Smidge which is based on Picaridin (This substance has so many names it is hard to keep track) and it just simply works in the sense that any area to which I apply it is completely devoid of insect bites plus it reduces the number of ticks I pick up as well, though that is hard to quantify. To be honest I find it more effective than DEET based repellents but, again, this is hard to quantify. The one big positive with Picaridin/Saltidin etc. is that it doesn't melt plastic stuff. Now modern DEET preparations say they've reduced this problem but when you are out a lot in midgy conditions it is hard to see that having the plastic bits melt off your car in one week, or in three weeks, offers any improvement
One thing I will say is that Smidge stops midges from biting you, it doesn't stop them from flying around you or getting in your food or... A lot of people, especially those with relatively low exposure to midges, seem to be at least as annoyed by the presence of the flies and not just the bites and so they sometimes report that repellents don't work well just because they've seen a midge fly around their head. Even with Smidge the midges will sometimes land on your hands, for example, it is just that they fly off again without biting. Headnets and the like offer an advantage in these circumstances but there are some things you can't do, or can't easily do, while wearing a head net.
Hopefully I'm going to get the chance to test a new (at least to me) product this coming midge season as it is always interesting to see how things progress and testing is relatively easy - cover one had with Smidge and cover the other with the new product and sit under a tree