I believe it was Circle Track magazine that had an article comparing the accuracy of inductive power timing lights. Some were seriously off.
Thanks for the replies gents.
Since I've never spent a lot on a light just was wondering about bang for buck.
As far as bb's comment above, it is noteworthy because I thought I had my initial at 14 with my old light. Then I put this one on it and I was at 10. So now I believe I will buy another one (read that as more expensive) just to have a good idea where I am.
BTW my old light was not a chrome Sears but some off brand they used to sell.