I think it's usually good to be the tall stack. At least if it's bigger than 4 times the buy-in. The possibility of bullying is great here since the new players that buy in will have only 1/4 of your stack. I think it gives the advantage of playing more hands and hitting more flops and picking up some blinds. I usually just try to avoid getting trapped and rather throw a big hand than jeopardizing a major part of my stack. Then again...my stack usually stops to grow when it reaches that point so I guess I'm not playing it right. But it feeeeeeeeeeeeeeeeeeels better