Used Biondos for a long time (still have one for a spare) but when we upated the car to Wilwoods all the way around we went with the Hurst one that came with a kit from SkinnyKids. Not a problem with either version.
Not to change the subject, but what's up with the the tiny ass hole that fluid is suppose to flow through on the biondo. That damn thing is about as big around as a hair. How can you push enough fluid through it to move 4 piston calipers? I just changed out my hurst after 10 years, thought it was bad but turned out to be my power booster. I had to drill out the biondo just to be able to push the brake pedal down. Haven't tested it yet because I'm still waiting on a power booster. Don't know if it will work or not but I had no other option. Might be going back to a Hurst when all is said and done.
I am pretty sure the Summit ones are made ny Hurst but I would stay away from them.Put 2 on my dads car and could not get either one to work.Sent them back each time then went ahead and bought the actual Hurst one and worked fine.Just think they do not check qualiity a well on the Summit ones they make.Just my opinion.