I have tried them out, about 700 games so far. Just to get a feeling.
350 $10's - ROI 11,5%. 350 games in $20's - roi 10,x%.
Regulary I am playing $92+ level reg and sometimes turbos.
I think pple play so bad these sng's. I dont use nash or anything like that. Have my own strategy and it seems to work. It is against my play in super turbos(nash, eq.). Ok, not against, but yeah... ehh.. You still can outplay them, you just need to
THINK, not just push/fold cos some kind of chart says so. Think, think over every move u make. Fold when u think u r beat(sometimes some big hands). Don't jump around and just clicking buttons.
I like to play only 2 tables at time.
I know that 700 games isn't much, but this is what I think about ST's no matter how many games I have played.
About bankroll. I would keep 100+ BI's for these. JUST because you don't think about it.