A pain in the arse you only need to do once, and you can hire someone to do it for you for basically the same cost as a couple of the high end wireless routers, so in like 5 years, you break even.

Also, how much have you spent on your computer (s), phone(s), tablet(s), and all your other internet connected devices, and you won't spend like $500 on something that can run all that stuff simultaneously? Pouring literally thousands of dollars on connected devices, but most won't pay more than they would for a toaster, to get them on the internet, then pay out the wahzoo for gigabit internet that your crummy d-link router can't handle, and you wonder why all your fancy gadgets run like shit.... It's a lot like buying a Ferrari to drive on dirt/gravel roads.

Way less so if your home is constructed such that the wireless is borked