It's being used at this season's Premiership grounds only, I think because of the leagues only the Prem is implementing it thus far. I agree with you though, either everywhere or nowhere.
Tottenham were shite, Boro OK, Liverpool scarily good, Everton caught in the headlights, Gills can be proud and West Ham relieved.
Whenever I see Priestfield on the telly, from the side where the main cameras are, it always reminds me of the Stadio Luigi Ferraris in Genoa, with those quadrilateral columns in the corners.