The special balls are quality in 2 player
You can really work a batsman over. I had a mate building a big partnership, banged one in which he miss timed and hit him and as such was on special. He was watchful for the whole over in case I slipped it in. By the time his next over came along, I carried on bowling some varied pace out-swingers, then I bowled 2 as quick as I could swinging away, and then another at yorker length. Finally I put it in position for another yorker, yet used the special ball version, he ended up playing all around it expecting the quick yorker and plumb