But I don't have any problems with my $20 router (17,65 €, actually). My home router is a TP-Link WR740N and it currently has an uptime of just over two months, the last reset being due to changing a port forwarding rule. I can't remember the last time it had a problem that required a reset. It serves a Linux laptop (madame's, on all day), three full-time Android devices and two Raspberry Pis. One Android and one RPi are all-day music and radio streamers, so there's a fair level of continuous traffic.
It has been my router of choice for domestic clients (now changed to the later WR841N) and I have had one failure out of 37 supplied. That failure had been on the receiving end of an unprotected lightning surge, so it's forgiveable.
As for Wi-Fi repeaters – they have 'flakey' writ large on them. Not a good solution to extending Wi-Fi cover: unreliable and inflexible, a poor engineering solution.
The first minute I saw these new Amplifi's...I was hoping they were using ethernet over powerline bridging. As I try to avoid using repeating or mesh when I can. I have setup mesh and repeaters before. Ubiquiti does a decent job with repeater mode in their Unifis.
Ubiquiti is strong on performance. I don't know the details of their repeater setup yet...but it's a wireless bridge and I think it's on the 5.0 band. Their setup utilizes both Band Steering, and Router Steering...which are two excellent features not usually seen in el cheapo products. I'm curious to see how it will do, and looking forward to it being thoroughly reviewed and tested by Tim over at SmallNetBuilder.
The market has proven over and over, it is willing to pay lots of money for higher performance WiFi that works. With large mcmansion homes being common these days, typically a single wireless unit cannot do the job. It does fine for me, I have a 3 story 3,600 sq ft home with my network distro in my man cave bar in the basement. Covers my 3 floors fine. But many newer homes are much larger, and spread out, sprawling. High performance, single device wireless routers, have done well in sales. Look at the higher end Asus RT models, or the Netgear Nighthawks, (most of those in the mid to upper $200.00 range). Your beloved TP-Link is releasing a new model, the Talon AD7200. MSRP of $350.00.
http://www.snbforums.com/threads/tp-link-releases-first-wireless-ad7200-router.32625/
Many newer homes have lots of devices that demand more bandwidth. Double digits and more for device counts. Wireless cameras. Wireless audio systems. Many homes with kids that pound bandwidth hard, and they need good QoS to the kids gaming, or downloading/torrenting, doesn't crush it for everyone else. Those loads will hammer cheaper hardware.
Having an easy peasy setup system that is truly "plug and play" for the average, non-network savvy home user, will do well.