from my personal experience i would stay away from 6436, went back to 6208. no issues with 6208 except for that annoying password was wrong bug wait 300 seconds after applying settings (fixable via rebooting httpd service from ssh)
on 6436 i noticed when using VPN-Fusion then setting my Device in the `Exception List` and hitting apply after changing the value in the `Connection Name` back to internet my config gets erased. when i rebooted it would be in setup mode again. i would check if config would break by doing a config backup in the save/restore tab & it would drop from 76Kb to 1kb it containd
HDR2˝˛˛˛˝ˇ˛˝˝˝ˇˇˇˇˇ˛˛˝˝˝˝ˇ˛ˇˇˇˇ˝ˇˇ˛ˇˇ˝˛ˇ˛˛ˇˇ˛˝˛˝ˇ˝˛˛˝˛˝˛ˇˇ
lines with no config values of any kind.
& even restoring config via upload when it was in the broken state before reboot the new settings would not apply after the reboot it would still boot into setup mode.
from setup mode it would restore settings fine.
i also noticed when toggling other options in config such as the check box "Click on this checkbox if you want to share the config file for debugging" when saving config also would break the config back to 1kb.
very scary stuff when saving setting & you never know after reboot that if your router would retain them or not.
i sure how this get fixed, this is very frustrating to have especially when you have a tone of brown outs during the summer here.