Swissair had them in Y on their A330s and as far as I know, Swiss did not reconfigure those planes, so Swiss probably has them. Swissair had a 31" pitch, so I don't think that pitch had to be increased to put them in. Those foot rests retracted upwards too, thus not blocking anything, so probably did not block evacuation were it needed. I do not know how they work on other airlines though as my flights on SR
were the only ones I have ever had footrests on. They were certainly good to have though.