Wireless Performance - more
For the 5 GHz downlink test results, keep in mind that the ESR1750 is an AC1750 class router and the ESR1200 is an AC1200. This means that the former has a 1300 Mbps maximum 5 GHz link rate, while the latter's link rate maxes at 867 Mbps. Both link rates were confirmed during testing. Despite the different link rates, however, the 5 GHz performance of the two routers was remarkably similar.
In the plot below, the ESR1750 tracked the ESR1200 at a slightly higher level, but still well below the ASUS and the TP-Link devices. Where as the ESR1200 lost its connection at 36 dB, the ESR1750 held onto its connection through 42 dB. Both the TP-Link and the ASUS both held their connections throughout the test range turning in 58 Mbps and 55 Mbps respectively at 45 dB of attenuation.
5 GHz Downlink Throughput vs. Attenuation
Finally, for the 5 GHz uplink tests, you'll note that the ESR1750 tracked the performance of the ESR1200 very closely throughout much of the range. As with the 5 GHz downlink tests, the ESR1200 dropped its connection at 36 dB with the ESR1750 failing at 45 dB. It's interesting to note that at 18 dB of attenuation and above, the TP-LINK significantly outperformed the ASUS completing the test while still getting an amazing 105 Mbps of uplink throughput.
5 GHz Uplink Throughput vs. Attenuation
While the Router Ranker for AC1750 class router shows that the EnGenius ESR1750 ranks as number 8 for Total Router, that's actually last place because there was a tie for #3 (Western Digital WDBNWNJ0000NBL and D-Link DIR-868L) as well as a tie for #4 (NETGEAR R6300 and Linksys EA6500).
If you check the sub-rankings (Routing Throughput, Average Wireless Throughput, Maximum Wireless Throughput and Wireless Range), you'll find that the ESR1750 is at or near the bottom of each of those as well. The Router Ranker just confirms what all of the tables, plots and charts were telling us—the ESR1750 just isn't a great performing router.
If you sort the Router Ranker by price, the ESR1750 comes at the fourth least expensive router AC1750 router at $140. But the cheapest router, the confusingly-named $105 Western Digital MyNet AC1300, has a Total Router ranking of #3. The next most expensive router is the $120 Linksys EA6500 with a ranking of #4.
EnGenius ESR1750 Ranking Performance Summary
For the ESR1750, I've reached the same conclusion as Scott did in his review of the EnGenius ESR1200. Unless you're looking for a realtively inexpensive router with VPN server capabilities, there's no compelling reason to buy the ESR1750. There are better performing routers below the ESR1750's price point and much better performing routers at higher price points. And if for some reason you want an EnGenius, the $20 cheaper ESR1200 will save you a little bit and deliver essentially the same 5 GHz AC performance.