I only took it three times:
First time was blotter paper.
2nd & 3rd - liquid on sugar cubes.
All about 10 years ago, when I was 19-20. First time, went midnight madness bowling with friends. Hung out. Drove home tripping at 3am. That was kind of a mistake. Friends tried to talk me out of it, but I was convinced I was driving home. I was doing fine until about 5 minutes from home. I started freaking out a little bit. Then Purple Haze came on the radio and I said something like "Take me home, Jimi" and he did
That song couldn't have come at a better time, honestly. I went home, laid down and closed my eyes and enjoyed the show. I honestly had a blast exploring it. Infinite tessellations of purple, green and red in a specific star pattern.
The other times were just hanging out in dorm rooms. Walking around campus, throwing frisbees. Nothing too crazy. The third and final trip, my friends started drinking vodka around 3:30 or 4pm on Friday. I dropped about 5-ish. So they were getting shit-faced at 8pm. Passed out by 9-10. I still had 7 hours to go. I went to my friends room, to find the door cracked and see him there in his tighty whities puking in his sink. I GTFO fast. That is not something someone frying needs to see. Called a girlfriend, she came over and kept me company, b/c I was tired of staring at the Winamp visualizations.
All pretty fun good trips. No real bad experiences, however, afterwards, I got extremely depressed. I was going to small college in a small town. I honestly felt like I couldn't relate to alot of people at this college, didn't have many friends there. Depression runs in my family and I honestly think LSD helped bring to the surface. Maybe it was I just became cognizant of it after tripping. But I do see that as like a turning point in my personality.
Flashbacks? I don't think I've done enough to get them. I did see some purple tracers after headlights in a car crossed my vision. I've seen purple streaks across my vision a few times. Maybe it is, maybe its not.../shrug
Honestly it was fun. Just beware, it can bring some things to the surface you might not knew was there, both good & bad.
this is all my experience / opinion.