There is definitely something going on with the 2.4Ghz radio in both the rv180w and rv220w in my environment. Since Cisco reproduced the issue, I'm really curious now.
If I switch to 5Ghz on the RV220W, my I get the full 25 Mbps of WAN bandwidth on my wireless connection. On 2.4, I'm getting 10-15 max. As I mentioned, the Netgear FVS318N has no problem in the 2.4Ghz band getting the full 25 Mbps.