Thanks for the link - Just quickly read through it. After some general research, there are a few issues up in the air for me.
1) Firmware - My unit came (and still is) on 4.1.4.5, which I understand to be an older binary. The newest firmware is 4.2.4.1. Apparently this firmware adds support for things like port forwarding. I find it odd though, that my modem port forwards fine with the older firmware.
2) Speeds - There seems to be some disparity between speeds when using the device in bridge vs. gateway mode. Although download speeds aren't my highest priority, nobody has been able to figure out why. From my personal experience, I haven't noticed that much difference in performance running between these two modes.
3) Connectivity - This is currently the thorn in my side. I want stability in bridge mode, something that I haven't been able to achieve. In gateway mode, I can run forever, but I detest having to port forward everything from my modem to my router, and then do it again on my router. It's a waste of a hop. I am hoping that 4.2.4.1 actually fixes this issue.
I would love to be able to exchange the CGN3 back to the CGN2 or the Cisco, but as you've pointed out, I would lose the 20mbps upload that I currently have, so unlike the OP, that is not an option for me. The CGN3 is the only modem that I can use, and at least with the current firmware that I have right now, is pretty broken.
L.