DOC vs LSD : very similar but also very different.
DOC is easy ride, LSD is speedy and fast (sometimes confusing) ride.
DOC transforms every music into good one (instant dance), so does LSD. Both are good for raves or outgoing activities.
Sleeping on DOC is easier than on LSD.
DOC is more clear-headed than LSD. Both can give you mind fuck.
You can't seem to get bored on DOC, I felt like I could watch anything for hours. LSD on other hand, is more of adventure type, doing nothing is boring but being on adventure is fucking awesome. (But DOC loves adventures too)
LSD can be more funny at the times, while DOC is always good mood (amphetaminey).
LSD seems more visual (objects appear to be alive), while DOC is more of enhancer (everything is beautiful and clean).
DOC feels a bit ecstatic, LSD feels a bit speedy.
Both are good, if I had to choose for only one, I don't know which I'd choose. LSD was my favourite before I tried DOC, now both are on the top of my favourite drugs. Maybe DOC would be better choice than LSD, but damn LSD has had it's moments no drug has ever produced for me.
Now on topic - I also tried 2C-E and DOC, but not combined together. Do a half dose of DOC and add a bit more than half 2C-E on top of it when DOC has taken full effect. Don't do both at full doses because it may become overwhelming and too much.