I've been told the MK2 are better because the slide guides won't wear out like the BSTs will. I also have both sets, including rubbers, but I've never bothered to fit the BSRs. Keep in mind the BSRs have 4 jets vs the 3 on BSTs.
I was on two of the old sites for a very long time, and now I have no post count and have to put in bullshit posts like this just to get my count back up high enough to buy shit.
I had a standalone on my old car called SDS which just has two magnets for the pickup, a high and low signal about 10 degrees before TDC seaparted 180* on the wheel. Two magnets was enough for batch firing. I assume with such low resolution you'd have to use hysteresis to calculate things...