It's exactly how you imagine it. The sheer euphoria of the rush is combined with instantly changing perception of the world around you, where true synaesthesia meaning finally opens it's secrets for you, where you can taste the colours, you hear them too. It's very scary experience at the beginning, but the euphoria lasts for the entire duration of the trip. You feel connected to the ever forgotten secrets of life, you finally understand the meaning of it, and you're one with everything. Best part about is - there's no pressure to repeat this experience anytime soon, because it was so intense. It also acts as brilliant anti-depressant (most psychedelics do actually). I have tried only one psychedelic IV - 4-HO-MET, and all above experiences are regarding this molecule. It was back in the day where anyone could get it fairly pure with no repercussions, these were the days...