I started Soylent at 1.4, but I've been drinking 3-4 bottles a day of 2.0 since its debut.
I've tried all the others, but added Coffiest - and now Vanilla- to the rotation as they came out.
I noticed at some point they added "can replace any meal, should not replace every meal," but I'd say there are probably 1-2 days per week it makes up 100% of my calories.
My main reason for moving to Soylent? Laziness - I just tired of reading labels, counting calories, and comparing this vs that. I didn't want to devote thought/stress out about my intake anymore - I just wanted something I knew was good for me.
Anyway - in addition to just grabbing a bottle, I often use Soylent as a base and add fruit (and other goodies) to make smoothies. I found the perfect 32oz metal cups and ice-killing stick blender. Not only did my diet improve, my trips to the grocery store are easy. And short.
I just realized the other day that it's been over a year since I turned my stove/oven on - so my gas bill benefits too.
I might still devour a pizza over the occasional weekend, but I tell folks that for the most part, I couldn't be eating better than I am right now.
Which reminds me - without doing a thing to change my activity levels (I work from home at a computer), my weight dropped by 15 pounds within the first 6 months of my switch to Soylent.
It still sits there - like me, but that's my next challenge