I'll give you a quick rundown, but yes do read those links as well.
DOC is 2,5-dimethoxy-4-chloroamphetamine, a psychedelic amphetamine related to the infamous "STP" of the 60s (which is a drug called DOM). It has a very low dose (1-3mg is a good range), and it lasts for 16-20 hours. It's similar to LSD but also quite distinct, I actually find them quite different though there are similarities. To me it feels like the lovechild of LSD and mescaline but it lasts longer than either of them. It's quite visual in a beautiful way, and after the come-up it feels quite good physically. It tends to produce some amount of calm euphoria. I have had moments of MDMA-level euphoria, but for the whole trip it remains very mentally sobering almost unless you take it really high. But in a good way; it's mentally sobering like amphetamine is, where you feel very sharp and on it and motivated. I find it to be very emotionally opening, and it basically enhances all of my senses, and makes everything I feel and perceive more intense. The trip is slowly unfolding, it begins a bit scattered and over the hours it comes together. Not everyone feels this way, but for me and many others it gets better and better as the time goes on. At around hour 10 for me it switches over into the plateau stage where the euphoria increases and I become intensely sociable and energetic. It's my favorite all-around psychedelic, I take it more often than I take any other psychedelic. You have to be prepared for that length of trip, you will not be sleeping for at least 16 hours if not longer (depending on how easily you can fall asleep). It really does last that long. But, at 3mg or under, I can pretty much still function in my day, it's not a debilitating kind of trip. And after the peak, around hour 8 to 10, it doesn't impair my functioning at all.