The TG588 is nothing special but it should be solid enough so good luck.
I have now had the latest TalkTalk super router for a couple of weeks and it works better than expected.
39Mbps upstream 12Mbps downstream, Gigabit ethernet and 5Mhz WiFi that covers all of my, admittedly small, flat at full speed.
Steam even let me download Doom again last week at an average of 34Mbps.