Well I have used PTC, Dynamic and Continental. All were good, no real issues to think of. They were also close enough so that sending them back to get another 100-200 rpms in or out of them was not worth it.

I currently have a Neal Chance bolt together I got with my current trans set up. If I can get them to get it to flash where I need it, I will use it. If not, up for sale and I will be in the market.