If I'm reading the specs right, the product has 23% DEET. My kids' camp recommends non-DEET insect repellents ie citronella oil. If you must use DEET, a maximum concentration of 10% is advised. (The concentration limit may be due to safety for children, but they have faster metabolisms than us old folk ie produce more heat & carbon dioxide for their size, which attracts the bugs.) My kids stopped using insect repellent some years ago, and they're in the Algonquin interior for half the summer.
When are you going birding? Blackflies are done by now (they're May-June critters), mosquitoes decline significantly in August. You can keep most insects away by covering up ie pull your socks over the cuffs of your long pants, button the collar & cuffs on your long-sleeved shirt, wear a hat. (One of my kids wore a hat with a net one summer, but that was for the Rupert River.) I only get bothered by ants when I foolishly garden in bare feet & legs (trying to get my Vitamin D at the same time). I have to admit my knowledge of ticks is pretty sketchy.
Hope this helps.