4 feet from my router:

5ghz network:
[ ID] Interval Transfer Bandwidth
Sent
[ 4] 0.00-5.00 sec 102 MBytes 171 Mbits/sec
Received
[ 4] 0.00-5.00 sec 102 MBytes 171 Mbits/sec

2.4ghz network:
Sent
[ 4] 0.00-5.00 sec 43.1 MBytes 72.3 Mbits/sec
Received
[ 4] 0.00-5.00 sec 43.1 MBytes 72.3 Mbits/sec


Farther away, other side of the apartment:
5ghz network:
Sent
[ 4] 0.00-5.18 sec 5.00 MBytes 8.10 Mbits/sec
Received
[ 4] 0.00-5.18 sec 5.00 MBytes 8.10 Mbits/sec

2.4ghz network:
Sent
[ 4] 0.00-6.49 sec 2.75 MBytes 3.56 Mbits/sec
Received
[ 4] 0.00-6.49 sec 2.75 MBytes 3.56 Mbits/sec


The second test, I ran a few times, and 3.56 was the best. It was highly erratic for 2.4, stable on 5ghz. With the somewhat densely packed apartment environment, 2.4ghz is nearly worthless. My WiFi selection list shows 15 networks available. Refreshing usually shows one or two drop off, and others take their place. So for me, 5ghz is well worth the investment.