My vote is for DOC and DOM, and I am also of a high opinion about DOB. Both DOM and DOB make their best at heavy doses, around 15 and 5 mgs respectively. They are far from being really close to each other in their action. DOB is irrational and even grotesque in the view of reality it produce, DOM is in beauty and transcendence. Advantages of DOC are simplicity and versatility, it goes best at medium doses, 3-4 mg.
I've had 3 experiences with DOI at high doses, first time it scared me a bit, impressed the second time and left in perplexity the last time. I feel like having no desire to do a heavy dose once more, though it is also nice in low (1 mg) doses.
Nature of DON is closer to 2C-X chemicals, it is mostly recreational. It is somewhat acceptable for me at low doses (2,5 mg), being not too stimulating throughout the trip and not too sedating at the end, not too heavy on the body or the mind. A lightweight, undemanding drug, unique among it's congeners. At medium and high doses it is dark and dull, and also too stimulating.