@Cory In terms of the G2 Wi-Fi performance, it is a 2 stream 802.11n radio. The G2 radio defaults to a 20 MHz channel width. If you have clients that can take advantage of a 40 MHz channel in 2.4 GHz, you should be able to see around 150 Mbps of throughput. However, most clients do not support this. Apple & iPhone, for example, can only support 20 MHz channel width in 2.4 GHz. They should see 60-80 Gbps of throughput in a clean environment.
We have designed quite a bit of intelligence into the channel management on the G2 to help it avoid other radio interference. Our auto-channel with pick the cleanest channel on boot AND constantly monitors the performance of the channel. If the performance degrades the G2 will automatically select a cleaner channel. There is no need to reboot the G2 to have it kick off a channel evaluation. In addition to the intelligent channel management, we have tweaked the Wi-Fi drivers so they are less susceptible to low signal level interference. Much like our ACG feature on the A5, the G2 has a feature similar in function that allows it to "squelch out" and ignore low signal Wi-Fi packets. This means the G2 doesn't need to retry/back-off when your neighbors faint, -95 dBi SSID is present.
We find these two features (active auto-channel and 'squelch') make a huge improvement in the reliability and usability of 2.4 in busy environments.