Been meaning to throw my five pence into this thread. Not sure if it's the right place for it, but I'd recently gotten through some 1P-ETH-LAD and just had some comments to share.
There is almost no mental load, but there is a significant body high. I remember on a dosage of 1.5 tabs (around 150 mics) I was convulsing and writhing in ecstasy for a while as I listened to some music (specifically:
https://www.youtube.com/watch?v=7uuwcPlxSJ4). However, there was no mind fuck. The only negative parts I experienced were general "weirdness", but it wasn't intense or bad. Just that - weird. I think it would be difficult to have an overly bad time on this chemical.
I've always thought it was quite weak in comparison to something like 1P-LSD or mushrooms, but this may be a different case for regular ETH-LAD. It seems to take a while to come up, and the effects aren't really "profound" as much as they are "interesting". It took a while for me to realise I was under the influence. When I did realise, however, it was quite shocking to observe how high I was yet still completely in control of my mental faculties.
Another interesting thing is that there were pretty much no closed eyed visuals, but there were very intense open eyed ones. Patterned items, such as plaid bed covers or sheets would vibrate and melt. Everything was moving. But when I closed my eyes I wasn't impressed - not much going on under the hood.
Talking to people seemed quite normal and I would have had a worse time trying to have a conversation whilst high on cannabis. No problems socially. I can imagine it would get a little bit fucked if you were dosing high, but then I would assume you would avoid social interactions at that point anyway.
The highest dosage I took was 150 mics, twice if I remember correctly. The other times were just 100 mics. 100 mics was still a substantial trip, but again, didn't run deep at all, and it was just more of the same at 150. I regret not taking more, but it was very expensive for what it was, and I'm not sure I'd pay as much as I did again. I didn't have much of the stuff to play with.
One of my friends tried a tab on his own. He had been previously accustomed to 1P-LSD once before. Unfortunately, he said that 1P-ETH-LAD took him to a bit of a bad place and he had what he described as a "bad trip". I found this quite surprising considering the fact that this stuff doesn't really seem that taxing on the mind. He seems fine now, and has learnt from whatever he may have experienced at the time. I won't go into details, but it sounds as if he was being a nuisance to his family, so perhaps it was just a poor choice of set and setting.
I would conclude that this chemical modifies your perception of the external world as an observer, but doesn't really influence you as greatly as regular acid does. It'd be great for a day out with friends or for a nice easy trip whilst walking the dogs or something similar. Looking at things is interesting, but there is a lack of depth that you get when looking at a tree on mushrooms, for example - less of a connection with the thing. There is very little mental challenge there, but there is a certain clarity to the experience that would be incredibly useful to a newcomer to the psychedelic realms.
1P-ETH-LAD certainly doesn't run as deep as the classic psychedelics, but that is what it is - a "novel" lysergamide.