Hi Tor- I used a set of Pulstar plugs in my '85 Subie 1.8L engine, years back before I did my Plasma build. Pulstar's are, of course the companion product to Direct Hits. I believe Direct Hits came out first on the market.
Anyway the Pulstar's worked pretty good for awhile, but started misfiring in maybe 8 months of light service. I never tried the Direct Hits, but I would give thumbs down on Pulstar's.
Tracy G