The basics: 1,4B is converted into GHB by your body, so you can get the general effects if you look up GHB on the internet.
What I experienced, from just a couple drops on my tongue, was a general improvement in my spirits and a return of my sense of humor. Something like what I've heard people experience when they're buzzed with alcohol. (I don't drink, and when I used to I'd just fall asleep.) Definitely didn't feel like I was "tripping out." I thought it tasted pretty nasty, but after a few other forum members chimed in I realized that while it wasn't nice flavored, the worst of it wasn't any different from alcohol.
Another user took 1/2 tsp with tomato juice, got a warm feeling in her stomach, and after 30 min fell dead asleep and slept for 11 hours, no ill effects afterward. Which sounds pretty promising. She didn't mention anything trippy.
A third user tried a dab rectally, to see if the forum members who have touchy stomachs can use it by enema, and reported no discomfort, so it should work rectally as well. Again, no trippy or ill effects.
This is very, very experimental, but considering that some sicko was using it to murder people over in England, and people do die of it on a fairly regular basis, it looks promising. It's promising enough to me that I ordered 2oz --probably(?) twice(?) what's needed(?) for a lethal dose-- from Amazon.
Threads and 311, the OP of the idea, are working on a concise version of the method right now. They already have a link up under Resources, but they don't yet have it leading to a document, so they must be close to a useable protocol.