I started my DE "career" with ATE but found myself bleeding it once a day, sometimes more. Heavy high-hp car with a green driver...a better driver in a lighter car certainly would have had a different experience. In any case, I switched to SRF which was rock solid but got too expensive as often as I was cracking the lines for one reason or another. I've been running the Wilwood 600 EXP this season and it's been great. It needed a quick bleed Saturday night at Cresson and one more at Hallett but for the price ($18), I'm happy with the performance.