My step up is currently at 500ml. the yeast is wispy if that is a word but settles moderately fast. I don't have a stir plate yet and by swishing it around most of the yeast settles within the hour. it doesn't clump up at all like most yeast that i have dealt with.
I imagine there is more than one strain of yeast battling for a job. so the joining of friends is limited.
Off of 500ml i can't get a true smell of the co2 released. a couple of more 500ml to build the army and i will be going for a 3/4 gallon.
after that depending how the DME liquid "beer" tastes i will proceed to a full batch of Blonde Ale