I received my order today (ordered May 22), and it looks like it's v1.4 (no surprised there). Since I plan to use Soylent for less than 50% of my daily calories, I didn't want to make a full pitcher full. Instead, I used one 250 kcal scoop to two scoops of water, mixed in a regular drinking glass with a spoon. Mixing wasn't too bad (no big chunks), but it wasn't great either (lots of small chunks floating on top). I may want to get one of those BlenderBottles for these single servings. Oh, and there were little 1mm specks of something yellow that stuck to the inside of my glass. Maybe that's the powered oil?
I didn't wait for my Soylet to sit (too curious), so I drank it right away. The first few sips were at room temperature and weren't too bad. There was more grit than I expected based on what I've read about 1.4, but I'd guess that if I let it sit in the fridge for a couple hours that would improve. I haven't tried Soylent <1.4, so I can't compare the taste to those versions. I think the descriptions that I've read that compare it with a thin pancake batter are probably the good match (not that I've tasted raw pancake batter, but the smells are very similar). I ended up adding a handful of ice cubes. Maybe that helped, maybe not. I didn't think it was overly salty and definitely not slimy (but again, I didn't let it sit in the fridge over night).
It's only been about 15 minutes, but so far my stomach has been fine. I had some burps (maybe there was air trapped in it as foam that would have come out if I'd let it sit?). I did need to rinse my mouth with water to get it feeling clean again. I don't think I'd want to drink Soylent without access to some chaser water. I wasn't super hungry when I started, but before I'd finished half of the glass I was already feeling quite full. I could see myself having a glass of Soylent for lunch pretty easily. I'm looking forward to trying some variations.