OK, I'll go with my experiences as a reference to newbies to pregablin.
300mg: Mood elevation, feel very happy, very calm and slightly drunk, balance goes.
600mg: Same as above but the drunk feeling is stronger. Feel energsed but also a lovely feeling of calm.
900mg: Same as above bu the drunk feeling is very strong, walking in a straight line would be impossible. But still feel fun. Slight euphoria maybe? Appreciation of music increases. Closed eye visuals are strong, bright lights, very straight lines. If you close your eyes you can feel like your somewhere else. Like your actually sat right in the middle of the northern lights.
1200mg: Same as above but CEV are amazing. You really feel like you've been transported tyo another existence. Everything there is so beautiful and colourful. Feel extremely drunk. Sometimes drowsiness sets in at this dose.
1500mg: Same as above but full out hallucinations. I feel totally wasted like I've had around 15 pints of lager. I turn into a drooling wreck. People turn into champagne bottles, cars turn into people walking dogs. The drowsiness is now almost uncontrollable and it is a big effort to stay awake. I don't reccommend this dose, I know I won't be doing it again.
Either way, with all doses, it always takes 1 & 1/2 to 2 hours for the effects to become noticeable. So don't expect a quick rush. I find the effects slowly come on and then get stronger over about an extra 2 hours. I've not looked into it but I would say around 4 hours after ingestion is when you are most under the influence.
I must also add that it is a very long acting drug. I have taken a dose of 1200mg at around 15:00 then done my thing, gone to bed and when I wake up, my balance is still a little off and you can still fell slight residual effects.
Be safe and know your limits.