I had the exact same experience. I've gone 6-8 months of taking roughly 200mg - 300mg a day with no major issues. When I've taken breaks (up to 6 months at a ti

I had the exact same experience. I've gone 6-8 months of taking roughly 200mg - 300mg a day with no major issues. When I've taken breaks (up to 6 months at a time) I didn't notice any real gain. The one lasting thing I've noticed is my tolerance. I've never been able to reset back to a "pre coffee" level where I could have like 200mg and be absolutely wired. It goes down, but nowhere near as much. Maybe 6 months isn't a long enough break...