@MearnsUnionist is correct, the legroom is the same in each row. Used to have my season ticket/debenture up there and also attended many matches buying a ticket up there. Same in each row from what I recall.
I moved across from the Govan Rear, in its old Premier Club days, and found the CD leg room a little bit more restrictive than GR. Its not awful though. View from the CD is great - so long as you're not afraid of heights.
Bottom line? Beggars can't be choosers. If that's what you've been offered I'd be inclined to take it then look for a swap next season if you find it doesn't suit once you get the chance to sit in it.