I used it today. You get about 6 seconds of green man followed by a countdown from 11 with neither green nor red man. Then red man, then after another second or two green for vehicles. Opinion: The farside, above head height symbols are easier to see and read (for directionality from a distance) than the nearsides. The green man time is barely sufficient. There seems to be, from what I observed, no variation in green man and countdown time according to circumstances (presence of people still crossing, etc) so I'm not sure what the advantage is of having countdown rather than making it all green (presumably to discourage people starting walking in the last 11 seconds). The major problems are the same as with any style of signal-controlled crossing: too long a wait for green man and crossing obstructed by queuing cars. Hopefully the last might be ameliorated when the surrounding roadworks finally finish (over a year and counting). Additionally, this one is a Toucan (I was on foot) but there is no indication of which side is walk, which cycle. Not that anyone ever takes any notice anyway. Again, that might be signed when everything's finished.
So far, little improvement over nearsides.