I'm about a week and a half into it now and can really tell a difference. It's funny you bumped this thread because today was the first day that I was totally in a zone. I was focused all damn day at work. I think it just hit me today, I can't wait until the others kick in a few weeks from now. I even woke-up this morning fresh & ready to go. I read other users stating that they felt fresher in the morning without much lag, and I didn't feel this until this morning.
Can't wait until tomorrow...!
BMJ