Didn't completely agree with Joey's comments here http://www.atlarge.com/comment/0,3800012705,60291644p,00.htm . T4 might lack some things but I've seen much worse shopping around the world.
That apart, I like the idea that T-Mobile has for the wi-fi 'hot spots' ie somewhere to sit and charge as well as connect wirelessly, though I must say that even next to one I couldn't find the signal.
Generally T4 wi-fi was a bit patchy. BT Openzone got uniformly good recpetion. The T-M spots aside, you have to duck and dive to find a spare power outlet.