Who is running PAC valve springs?

I work at a cylinder head shop, we mainly use PAC & Manley springs. Comp is ok, it just depends on the application.
 
I run them in my 440 with a hyd roller cam. I had one break on me while cruising down the highway. I got lucky and didn't hurt the motor. They knew exactly where it broke too (where it begins to taper). Great customer service though, they gave me a new set and I havent had an issue since (2-years). I think it was just a fluke as most people have good experiences with them.
 
Over 1,000lbs of spring pressure on the nose of my cam and 9,000+rpm for 60 runs before needing to change them. That seems worth it to me.
 
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