Disco, The leading edge is indead very straight combined with quite a low bounce enabling you to nip the ball off very tight lies!
This range of clubs (I am right in thinking) has been designed for use on Links type courses where the ability to nip the ball is needed more than on lush inland courses, Where the Ball may sit up a little more on fluffier grass
Hope this helps you decide, IMO they are beautifully designed wedges and are extremely good Value for money!