I have been playing around with the new firmware, its a bit buggy, this is what I have experienced when testing. When using the blue WAN port, the connection drops intermittently, and seems to sometimes confuse the router in some way as when devices reconnect after being in sleep or hibernate they can not access the internet or the router gui itself for about 5 minutes. They get a DHCP lease and all the connection stats look right, but I couldn't ping the router. Eventually it just started working for a little bit but then occasionally stops again. Looks the DNS times out too when the connection drops, that could be TalkTalk DNS not sure. After a while the router stops allowing you to log in through the GUI even if they are the correct credentials and will just start timing down from 5 mins before I can retry but that doesn't work after the count down either, only way is to reboot it to get it to work. Telnet login works ok though.
Tried the internet connection through DSL port just as a test see if there was an differences in sync rate in case they updated the DSL driver, nothing different there for me anyway, however the xdsl statistics details is in a small expandable box and you have expand it each time to see the stats. Internet seems to run fine through that though no dropouts. Eventually that page stops working too, just says "get unsuccessful, please try again" when attempting to retrieve stats. The wireless seems ok luckily they didn't ruin that. The main screen is slow to load information, and the navigation is too big in terms of buttons and font size, have to scroll down (if you can) to access them (edit seems to not adjust to different screen resolutions). The gui is unresponsive making you wonder is it going to respond to me clicking a button, most time I have to refresh to get it work. It has more or less the same settings from old firmware present in the new firmware its just a lot more slow, buggy and not that well tested I think. I would attach screenshots of the some of the gui but I cant get into it again, but cant reboot as internet is being used. Zyxel have taken something good and nearly ruined it. The saying why fix it if it ain't broke comes to mind.