I also personally loved the Sure Shots. Whenever I did clusters back then, I would always use them.
The old Estes also worked good for me after a careful inspection and not damaging them during insulation. I set them in place and pushed wadding between the wires to hold them in place as was one of the recommendations back then. I believe the plastic plugs used today could damage a Estes igniter unknowing to the rocketeer. I do admit that I really don't have any problem with them but when it comes to clustering, I do have some concerns. Of coarse the new igniter can't really be trusted for clustering as compared to the old one.

But the Sure Shot was the better choice in my book anyway.