Figured I might as well share my experiences with 5-meo-dalt here...overall I have been very pleased with it, it's a very "light" substance when used in lower dosages (around 40 mg oral for me), sort of similar to being tipsy, if that "tipsiness" could be turned up without ever getting really drunk. A very enjoyable ++. Good body high, general but managable euphoria, loosens things up a lot, great for conversation, enhances appreciation for things I already appreciate, especially music videos and movies. At the same time it's very clear-headed at lower doses, and there were times I found myself picking up on details in movies I had seen before but missed while sober. There are mild visual effects at lower levels, trailing and strobing and the like, faint but colorful CEVs, sort of like seeing brightly colored gardens through colored foggy plastic that never really come into focus. I tend to feel most comfortable while sedentary, and feel less willing/able to move around as the dose increases. It makes for a very fun 3-4 hours on a weekend with friends or in front of the computer or TV, and lets me do everything I normally do for fun, but enhances that enjoyment. Sex for example is fucking awesome. It can also be good for introspection, but in general it's not really that kind of substance. Never had a bad experience on the stuff, out of maybe 20 times in a 6-month period.
As for side effects, food tastes a little weird, but there's no nausea or diarrhea or anything. Usually I have to take a crap really bad within the first 5 or 10 minutes, but that's likely just a result of mild anxiety. It tastes pretty bad, like sawdust or something, but nowhere near as bad as some substances out there. There is a definite "hangover" once you come down, but it's mostly in the form of a mild headache and mild bodily discomfort; all physical, no depression or anything. That goes away after an hour or two, and it's a good idea to wait until it wears off before trying to sleep.
Overall 5-meo-dalt occupies a nice niche, below heavier stuff like LSD and shrooms and DMT. At higher levels (I got up to about 55 mg) 5-meo-dalt started to take on the character of a more traditional psychedelic, maybe around a ++ 1/2. I haven't tried more than that yet, since if I want an intense experience I usually turn to something else, but I certainly intend to eventually.