Used to take them loads, knew a bloke called Mushroom Dave, who lived on a narrowboat and used to travel the country every mad season filling bags and bags with them, then he'd powder them and make chocolate bars with them, so they'd keep, and be enjoyable to take.
Stopped taking them when they just started being the same every time. Everything would go purple and green and I'd feel really decrepit, like Mr Burns or something.
Always preferred acid tbh. Started in my teens and pretty much tripped through most of my 20s.