It also caused a riot
https://www.bbc.co.uk/sport/football/46041706
Not saying that it won't correct a lot of obvious bad errors, but football as a sport isn't linear enough for massive moments (penalties in particular).
Where I think it could be better is to mimic the cricket way of doing...
Too many grey areas in football for it to work properly. The only area it would work is offside - a binary decision - and even then there is the grey area of "interfering with play"