NETGEAR Universal Wi-Fi Range Extender: Broaden your network connection with a range extender that gives you extra Wi-Fi coverage in your home. Smart LED indicators will direct you to the optimal location to plug the extender into the wall, so you can easily enjoy improved range and speed on your mobile and wired devices. Save on data usage by connecting your smartphone or tablet to your home network.
Purchased this extender for a N750 "wndr4000" Netgear router that had a weak signal to my far off bedroom with several walls in between. Works very well, although requires an occasional (monthly or so) reboot. Easy to install, and the reboot just requires unplugging for a minute. I run a Roku, 2 outdoor surveillance cameras, as well as a laptop and Android tablet through it.
What's great about it: Good price, easy install and mostly reliable