Performance - more
5 GHz downlink shows the Edimax with a clear advantage that quickly disappears once signal levels get past 15 dB of attenuation. The TP-LINK and NETGEAR are very evenly matched as strong to medium signal levels. But the TP-LINK degrades quickly after that, disconnecting at 39 dB of attenuation along with the Edimax.
5 GHz downlink throughput vs. attenuation
5 GHz uplink again shows the Edimax' uplink weakness. But the TP-LINK doesn't do very well here either, starting out with only 50 Mbps of throughput, then tracking down with the Edimax until both disconnect again at 39 dB of attenuation.
5 GHz uplink throughput vs. attenuation
The Wireless Adapter / Bridge Ranker fairly accurately sums up the releative performance of the three N600 bridges tested. But that's not to say any of these products is an overall stellar performer. You really need to dig into the details of how each product performs in the band you'll be using it on to make the best choice.
In the TL-WA890EA's case, it's safe to say that range in both bands is not its strong suit. Its Ranker Performance summary shows 0 Mbps (disconnects) at each of the benchmark test points used for range ranking. The only reason you see a #2 Range ranking instead of #3 is that the other two products tied for #1 in range.
The bottom line is that if you need a bridge with four 10/100 ports (or even if you only need one port), the N900 NETGEAR WNCE4004 is a better option.