Seems to be a popular choice here with no negative feedback to date, anecdotally speaking. I've been running it for 1.5-2 years, 20Kish miles, lots of urban...
Gas that is a few weeks old these days is suspect. I buy Non Ethanol 91 Octane and drive it daily. I do not think mine is gas related.
I am curious if yours had the White crystalline snow flake deposits?
Singer Sewing Machine smooth - 44k miles. The only reason I changed them was PM. No CEL. No 26 or Lean Codes.
1st image is a close up of what Cylinders 1 thru 4 look like. Powdered Donut crystalline white.
2nd Image is what Cylinders 5 & 6...
I noticed after doing the PHH bypass loop on mine that the area above the BRake Booster (my PHH bypass loops around the Brake Booster was noticeably warmer. I only notice it on cool Fall or Winter days. You cannot feel it in the Summer.