I was lucky enough to be living in Cardiff when they announced we were getting the trial exchanges. Unfortunately I was in the proces of trying to move house so couldnt sign up which I was itching to do since the broadband connection I had was utter rubbish. It didnt matter which provider I was with, it was slow and unreliable as hell. I never did get to the bottom of what the problem was but I always suspected some dodgy wiring since my neighbours were generally happy with their connections. |(
So feb last year I finally moved house and thankfully infinity was available so I made sure I got it. Considering how bad things were with my previous connection, just a stable connection would have been an improvement.

ray:
Well it's our first anniversary in the house tomorrow (15th) and the only time I've called BT about it was when a large portion of the country got affected by an outage in October.
I genuinely could not be happier with my connection! :rockout: :dance:
One thing I will point out which will have a big impact on the speed's you experience is your wireless connection. My main PC sits in the room next to where the router is (upstairs) so I typically get around 30-32meg. The computers downstairs struggle to make it double digits so unless your computer is connected via wire, or sitting in the same room as the router your going to struggle to get high numbers.
Another thing I have definately noticed in the last 12months is the general speed of my downloads is a little lower than when I first had it installed. I can only put this down to contention at the exhange which doesnt suprise me with the amount of advertising BT has been pushing out.
So if you signup for infinity expecting the greastest thing since sliced bread then prepare to be disappointed but if, like me, you didnt have a particularly good connection to begin with it should be a revelation.