My previous experience is with only Powder 1.6, which I actually like and tastes like pancake batter to me. Over the past two weeks I've transitioned to about a 50% diet of Powder 1.6 using stockpiles that I had purchased in 2016.
I recently ordered a case each of 2.0 Original, Cacao, Nectar, and Powder 1.8, and it just arrived. I've cracked open a bottle of each, and mixed up a small tester of Powder 1.8. Here are my initial impressions...
Powder 1.8 kinda tastes like skim milk that's starting to go bad. It's not nearly as sweet as 1.6.
Drink 2.0 Original tastes kinda oaty. Maybe a watered down version of the flavor of the leftover milk in a bowl of Cheerios.
Drink 2.0 Cacao tastes exactly like artificially flavored chocolate protein powder, with a little bit of chemical after-bite.
Other people are spot on about Nectar. It has that chemical taste of Fruity Pebbles. It's not good, but not revoltingly nasty like some people claim. I also don't catch the aroma that some people have mentioned.
I didn't order any Coffiest because I think coffee is incredibly disgusting and had no interest in trying it.
Cycling back through a sip of each, Powder 1.8 tastes much worse after trying the 3 liquid variants. The slight sour milk tastes is more pronounced now.
Just in order of taste, I would rank them:
Ultimately, I will stay on Powder, but will also order some Cacao now to supplement in situations where I need the added convenience of the pre-prepared version.
I routinely add a little bit of cookies 'n' cream or strawberry flavored protein powder to my 1.6, and I'll do the same for 1.8. I may also try the peanut butter trick. Others have indicated that 1.8 also improves after it chills. My intention is to live on about 75% Soylent for the rest of the year since I'll be on the road full time for work starting in May.