For my 2c - I have a 2.4 ePMP SM at my house. I'm right in town, and shooting about 4km over the city, and I can hear a bazzilion routers.
With our previous gear, I basicaly had given up on 2.4Ghz in town (of course) since (obviously) no one can possibly use 2.4Ghz in a city (obviously)! My previous AP/SM combination could sometimes get 4-5mbit in the middle of the night, but at 7-11PM we would be pretty lucky to get 1-2 Mbit. BUT, it is 2.4Ghz and it's right across town, so what else should one expect, right? SO - we decided that my place would be a good test for the Cambium 2.4Ghz. I mean, it's a horrible environment, but we had good long term tests with non-Cambium gear, so if it even links up from there, then that'd be a good indication of how well it would work in the Rural areas for us.
SO - I replace the AP side with a Cambium ePMP-1000 GPS Synced AP (using the same KP Sector that was there) and I replace the SM side with a Cambium ePMP-1000 Non-Synced Connectorized SM (connecting it to the same 22dB DualPol grid that was there). So, no adjustment to antennas or aiming. Signals are in the mid 50's, 20Mhz wide, Channel 9 / 2452Mhz...
...and I get about 100 Mbit agregate - about 70 Mbit down and 30 Mbit up.
As I mentioned, the previous non-Cambium 2.4Ghz gear would barely work at that.
By the way, the SM I'm using is an ePMP 1000 with connectors, and it's attached to a dual-pol 22dBm Lanbowan wire grid. (http://www.lanbowan.com/ANT2327D22PG-DP.htm) It's front/back wouldn't be great, which means the SM is dealing with un-necessary noise behind it too. I have some 2.4Ghz Force 200's here now (Yay!) and I expect that should improve interference even more.