Brad Penn oil, Anyone useing it

I have been running Kendall racing 20/50 GT-1 since the 416 was completed 4 years ago changing my oil once a year at probably just a couple thousand miles a year. Not a ton of miles but so far so good. Idling close to 40 psi (~1000 rpm in neutral) today at 90+ degrees after my 10 or so mile drive home stop and go through traffic. I paid $3.19 a quart for the last case I bought this spring. My cam is a fairly agressive flat tappet. I will be the test subject but we will see how long this lasts as I feel this is a great oil option at a good price as they supposedly have enough zinc left in their formula.