I have gone to Clemson for five years (yeah super senior I know), and have extensive experience with lyrica.
At first I could take 100mg and colors would pop and mesh so nicely and I just floated through the world. But as everyone here has noted, tolerance came on quickly and the effects are quite variable from person to person. I have, on several occasions, taken doses I wouldn't feel now and been scarily screwed up, twitching and all. But that doesn't happen anymore, and I can take 3g of it and feel less good than if I take 500mg. I don't know why this is.
I also have not ever had any significant withdrawal effects to mention, but I have only been taking it a 3-5x a week and not everyday (for a year).
For anyone that does not have experience with lyrica please start LOW. You can always easily take more, and although I don't think you'd have any serious health problems you can become very uncomfortable and wished youd never taken it.
Be safe and have fun!
Luxurious Beagle