I ran an original Magna Spark from the 1990s until this past Spring when I installed a Magna Spark II. The original was always a good unit, but it was getting on in years and was hard to find advance springs for so I made the switch.
So far, the new version has been all they said it was in the marketing hype. I also ran it on a Sun Distributor tester for a while and the curve was smooth and no spark bounce noted from 500 engine rpm all the way to 7 grand.
Nicely designed and very nicely made.